Is this article helpful to you?
Please consider donating or volunteering
Thank you!
Information on the email subsystem used in SME Server covering sending/recieving, spam filtering, virus checking, webmail, domains and users.
Troubleshooting
I am having trouble getting sme to send and receive email.
Sending and receiving email are separate functions. You need to investigate each individually.
Sending
If SME server does not send mail, you need to examine the /var/log/qmail/current logs to see what happens when it tries. Most commonly problems can be solved by sending via your ISP's mail server, possibly using encryption and/or authentication. Read the manual.
Receiving
If SME server does not receive mail, then you need to ensure that SMTP connections reach your SME server (DNS settings, router configuration, ISP port blocks) and then you need to examine /var/log/qpsmtpd/current logs to determine what SME server does with the incoming connections. Most problems are DNS, router or ISP issues, and have nothing to do with SME server operation or configuration.
qpsmtpd "Connection Timed Out" errors
See Bugzilla:6888 and Bugzilla:2360
A qpsmtpd timeout error may arise, this is not an issue that is caused by SME server directly, however it can become an issue depending on hardware and configuration settings that are contained in and around other enviroments.
It is discussed under various names
- Path MTU Discovery Blackhole http://www.phildev.net/mss/mss-talk.pdf
- Path MTU Discovery Failures http://www.wand.net.nz/~mluckie/pubs/debugging-pmtud.imc2005.pdf
- TCP Problems with Path MTU Discovery http://www.ietf.org/rfc/rfc2923.txt
As discussed in Bugzilla:6888 a workaround was found that may help in mitigating the issue.
The tracepath utility (included with SME 8.0 and SME 7.6) can be used to locate non-standard MTU values between your SME server and any remote host.
You can discover the smallest MTU between you and google.com (for example) by running this command, then locating the smallest value of "pmtu" in the results:
tracepath google.com
If tracepath returns any value below 1500 between your SME server and a mail server that you need to receive email from, you may need to reset the MTU on the SME server to match the smallest value returned.
For example, if tracepath returns 1492 (typical for internet connections using PPPoE), you would need to set the MTU on your SME server to the same value (1492) using the following:
config setprop InternalInterface MTU 1492 signal-event post-upgrade; signal-event reboot
Webmail broken after upgrade
After the usual post-upgrade and reboot, webmail is broken with messages like the following in the messages log:
Apr 20 17:29:53 mail [4614]: PHP Fatal error: Call to a member function on a non-object in /home/httpd/html/horde/imp/lib/Block/tree_folders.php on line 65 Apr 20 17:29:53 mail [4614]: PHP Warning: Unknown(): Unable to call () - function does not exist in Unknown on line 0
As workaround, logout of Horde, close the browser, reopen, log in to Horde, Webmail should now be fully functional. (Based on suggested fix in Bugzilla:5177)
Spam
Spamassassin
Spam filter with Server-Manager
Using the Server-Manager Configuration/E-Mail panel, adjust the settings to these reasonable defaults.
- Virus scanning Enabled
- Spam filtering Enabled
- Spam sensitivity Custom
- Custom spam tagging level 4
- Custom spam rejection level 12
- Sort spam into junkmail folder Enabled
- Modify subject of spam messages Enabled
I would also recommend blocking all executable content. To do so, select (highlight) all of the attachment types other than zip files (the last two).
Click Save.
How It Works
When receiving an incoming message, the server first tests for RBL and DNSBL listings, if enabled. If the sender is blacklisted, the messages are blocked outright and Spamassassin never sees it.
With this configuration, the spammiest messages, those marked as 12 or above, will be rejected at the SMTP level. Those spam messages marked between 4 and 12, will be routed to the users' (IMAP) junkmail folder. This is done so the users can check for false-positives...valid messages that were classified as spam by SpamAssassin.
Users may check their junkmail folders for false-positives via webmail, or, if they are using an IMAP mail client, by simply checking the junkmail folder exposed by their mail client.
https://servername/webmail
Enable/Disable Filtering Per-User
This procedure doesn't really disable the spam filtering, it just stopps the spam from being routed to the 'junkmail' folder.
Per-user filtering is enabled by default. Disable filtering with the following command, as root:
db accounts setprop USERNAME SortSpam disabled db accounts show USERNAME # only displays settings signal-event user-modify USERNAME
Use the Junkmail folder
The Default spamassassin behaviour put spams in the inbox which is very convenient for users in case of false positive, but it is not practical for learning, and especially it does not facilitate the life of the user (setting is available via the manager). If you want to put directly spams in the junkmail folder issue the command above.
config setprop spamassassin SortSpam enabled signal-event email-update
Message Retention Time
Set spamassassin for automatically delete junkmail. You can change the "days" that spamassassin sets to automatically delete junkmail, to delete after two months
db configuration setprop spamassassin MessageRetentionTime 60 signal-event email-update
Spam score Level and Spam score rejection
The "Custom spam rejection level" will only work when "Spam sensitivity" is set to custom.
- Open server-manager.
- Click e-mail in the navigation pane (left-hand side).
- Click Change e-mail filtering settings.
- Change "Spam sensitivity" to custom and adjust the settings to your liking.
This happens because by default, no mail (except for viruses) gets rejected without the admin doing something first.
As a reference, the following setting will have the following behaviours :
| Sensitivity | Spam tagging level | Spam rejection level |
|---|---|---|
| Custom | TagLevel value (Custom spam tagging level) |
RejectLevel value (Custom spam rejection level) |
| veryhigh | 2 | No rejection |
| high | 3 | No rejection |
| medium | 5 | No rejection |
| low | 7 | No rejection |
| verylow | 9 | No rejection |
X-Spam-Level Header in Email Messages
SME does not create an X-Spam-Level header in processed email messages by default.
To enable this capability:
/usr/bin/yum install --enablerepo=smecontribs smeserver-qpsmtpd-spamassassinlevelstars signal-event email-update
(Based on Bugzilla:3505)
spamassassin qpsmtpd's plugins email size limit
This db configuration setting sets the maximum email size above which spamassassin will not apply the spam filtering rules as have been set.
The default setting is 500kb, to increase the maximum size, apply the following commands from a root terminal
db configuration setprop spamassassin MaxMessageSize 2000000
increases message size to 2mb, apply the change with
signal-event email-update
(Based on Bugzilla:7606)
Custom Rule Scores
You can customize the score assigned by a specific Spamassassin rule (SARE_ADULT2 in this case) as follows:
mkdir -p /etc/e-smith/templates-custom/etc/mail/spamassassin/local.cf cd /etc/e-smith/templates-custom/etc/mail/spamassassin/local.cf echo "score SARE_ADULT2 20.000" >> 20localscores signal-event email-update
You can now add additional tests and custom scores by editing the newly-created template fragment 20localscores and adding new custom scores using:
nano -w /etc/e-smith/templates-custom/etc/mail/spamassassin/local.cf/20localscores signal-event email-update
Each custom score goes on its own line. If you enter a score surrounded by parentheses, the "custom" score will be added to the default score for the specified test (use score TEST_NAME (-1) to reduce the score for 'TEST_NAME' by 1)
You can remove these customizations using:
rm -f /etc/e-smith/templates-custom/etc/mail/spamassassin/local.cf/20localscores signal-event email-update
References:
- http://spamassassin.apache.org/full/3.1.x/dist/doc/Mail_SpamAssassin_Conf.html#scoring_options
- http://spamassassin.apache.org/tests_3_2_x.html
- http://www.rulesemporium.com/
SPF mail rejection/flagging policy
SME server can protect based of SPF records using spamassassin and the 'sender_permitted_from' plugin. The following lines will enable the plugin.
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/ cd /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/ echo sender_permitted_from spf_deny 1 > 30spf /sbin/e-smith/expand-template /var/service/qpsmtpd/config/peers/0
Then set your custom rule scores using the Custom Rule Scores section of this page. You should base these scores on your settings in server-manager > Configuration > Email > Change e-mail filtering settings or via db config commands for those with that skillset
echo "score SPF_SOFTFAIL 6.000" >> 20localscores echo "score SPF_FAIL 14.000" >> 20localscores signal-event email-update
In our testing an email that doesn't match SPF records and the sender domain owner has defined a soft fail, if is attributed 6 points and sorted to junkmail folder. If the sender domain owner has defined a hard fail the email attibuted 14 points and is subsequently rejected.
References (but instructions changed to meet new qmail structure):
Pyzor Timeout
See Bugzilla: 5973
This can be mitigated by the adding of a template fragment.
Template fragment to set a pyzor_timeout based on a value in the config db. If no value is set, there is no output (so pyzor uses it's internal default).
mkdir -p /etc/e-smith/templates/etc/mail/spamassassin/local.cf/50pyzor_timeout cd /etc/e-smith/templates/etc/mail/spamassassin/local.cf/50pyzor_timeout nano 50pyzor_timeout
Contents of 50pyzor_timeout
{
my $pyzor_timeout = ($spamassassin{PyzorTimeout} || 0);
if ($pyzor_timeout ne '0')
{
return "pyzor_timeout " . ($pyzor_timeout);
}
}
Then a value can be set using:
config setprop spamassassin PyzorTimeout 15 signal-event email-update
Whitelist and Blacklist
If mail comes in and it is misclassified as spam by Spamasassin, you can add the sender to the Spamassassin whitelist so that future messages coming in from that sender are not filtered. Conversely, you can add a spammer to the Spamassassin blacklist so you never see their spam again. Add senders (or their entire domains) to the global whitelist (or blacklist) with commands similar to these (as root):
db spamassassin setprop wbl.global *@vonage.com White db spamassassin setprop wbl.global *domain2.com White db spamassassin setprop wbl.global user@domain3.com White db spamassassin setprop wbl.global spammer@spamdomain.com Black
you can block an entire TLD but please be aware that you might be denying a legitimate email in the future.
db spamassassin setprop wbl.global *@*.xyz Black db spamassassin setprop wbl.global *@*.link Black
expland template and save the configuration to the database
signal-event email-update
You can view the lists with this command:
db spamassassin show
These lists can be also controlled by the server-manager with the wbl contrib http://wiki.contribs.org/Email_Whitelist-Blacklist_Control
Testing
You can check the auto-learning statistics with this command. You will be able to note the accumulation of the spam tokens (or not). Note that the Bayesian filtering must receive 200 spam messages before it starts to function, so don't expect instantaneous results.
sa-learn --dump magic
You can check the spam filter log with this command:
tail -50 /var/log/spamd/current | tai64nlocal
Check spamassassin configuration like this:
spamassassin -D --lint
If you ever see an error such as:
warn: bayes: cannot open bayes databases /etc/mail/spamassassin/bayes_* R/W: tie failed: Permission denied
Try adjusting some permissions with these commands:
chown :spamd /var/spool/spamd/.spamassassin/* chmod g+rw /var/spool/spamd/.spamassassin/*
Real-time Blackhole List (RBL)
Enabling RBL's
RBL's are disabled by default to allow maximum accommodation (your ISP may be on a RBL & you may not know it). You can enable RBL's by:
config setprop qpsmtpd DNSBL enabled RHSBL enabled signal-event email-update
You can see your RBL's by:
config show qpsmtpd
You can add to your RBL's by:
config setprop qpsmtpd RBLList <rbl-list-name> signal-event email-update
Many will argue what's best, some say the SME defaults are too aggressive and affect some popular free webmail accounts, but most would agree that you can set stable, conservative and non aggressive settings by:
config setprop qpsmtpd RBLList zen.spamhaus.org signal-event email-update
A conservative setting for the associated DNSBL SBLList is:
config setprop qpsmtpd SBLList dbl.spamhaus.org signal-event email-update
Note: More information on this topic can be found here:
[1]
[2]
Possible issues with RBL
When an external dns provider is set in the console menu, it may interfere with some blacklists activated here (RHSBL and DNSBL). The black.uribl.com is know to bounce all emails in this case with a rejection message delivered to the sender. You can in this case
- Remove the black.uribl.com of your SBLList
config setprop qpsmtpd SBLList multi.surbl.org:rhsbl.sorbs.net:dbl.spamhaus.org signal-event email-update
- Let the SME Server being the only dns resolver by removing the dns provider/forwarder in the console menu.
See http://uribl.com/about.shtml#abuse for more information about this issue with black.uribl.com
Obsolete lists
These lists can not be used with smeserver. A migrate fragment will remove them from your settings each time you reconfigure your server.
- RBLList
combined.njabl.org
list.dsbl.org
multihop.dsbl.org
dnsbl.ahbl.org
- SBLLIST
blackhole.securitysage.com
bulk.rhs.mailpolice.com
fraud.rhs.mailpolice.com
porn.rhs.mailpolice.com
adult.rhs.mailpolice.com
bogusmx.rfc-ignorant.org
ex.dnsbl.org
Server Only
Some of the spam filter rules cannot work unless the SMESERVER knows the external IP of the box. If you put a SMESERVER in server-only mode behind other firewalls, it will lose some of the anti-spam rules. For example, the rule that blocks attempts where spammers try "HELO a.b.c.d" where a.b.c.d is your external IP address.
Unfortunately, many admins believe that port-forwarding SMTP provides additional security. It doesn't, it limits the SMESERVER's ability to apply some rules.
I want to enable GreyListing
GreyListing support is under the covers and can easily be enabled for those who know what they are doing. However, many experienced users found that they spent more time looking after the greylisting configuration than they received in benefit. see Greylisting
Bayesian Filtering
From Wikipedia:
Naive Bayes classifiers work by correlating the use of tokens (typically words, or sometimes other things), with spam and non-spam e-mails and then using Bayes' theorem to calculate a probability that an email is or is not spam.
SME server supports bayesian filtering, but does not have it enabled by default.
Enabling bayesian filtering, autolearning, and spam/ham training allows spamassassin to learn from received email and improve spam filter performance. Bugzilla: 6822
Bayesian Autolearning
The following command will enable the bayesian learning filter and set thresholds for the bayesian filter.
config setprop spamassassin UseBayes 1 config setprop spamassassin BayesAutoLearnThresholdSpam 6.00 config setprop spamassassin BayesAutoLearnThresholdNonspam 0.10 expand-template /etc/mail/spamassassin/local.cf sa-learn --sync --dbpath /var/spool/spamd/.spamassassin -u spamd chown spamd.spamd /var/spool/spamd/.spamassassin/bayes_* chown spamd.spamd /var/spool/spamd/.spamassassin/bayes.mutex chmod 640 /var/spool/spamd/.spamassassin/bayes_* config setprop spamassassin status enabled config setprop spamassassin RejectLevel 12 config setprop spamassassin TagLevel 4 config setprop spamassassin Sensitivity custom signal-event email-update
These commands will:
- enable spamassassin
- configure spamassassin to reject any email with a score above 12
- tag spam scored between 4 and 12 in the email header
- enable bayesian filter
- 'autolearn' as SPAM any email with a score above 6.00
Note: SpamAssassin requires at least 3 points from the header, and 3 points from the body to auto-learn as spam. Therefore, the minimum working value for this option is 6, to be changed in increments of 3, 12 considered to be a good working value..
- 'autolearn' as HAM any email with a score below 0.10
Check the bayes stats with the command:
sa-learn --dump magic
The database is located in /var/spool/spamd/.spamassassin/bayes
LearnAsSpam / LearnAsHam (spam/ham training)
LearnAsSpam & LearnAsHam are scripts that can be installed on your server to allow users to manually "train" the bayes database. Training is done by users moving Spam from their Inbox to the "LearnAsSpam" folder, and by COPYING real email that was delivered to junkmail into the "LearnAsHam" folder. All messages in both LearnAsSpam and LearnAsHam are deleted once they have been processed and their tokens have been added to the bayes database.
To install:
- Enable bayes database as described in Bayesian Autolearning
- Install smeserver-learn as per wiki page Learn
- Instruct your users to move any SPAM they find from their Inbox to their LearnAsSpam folder, and to COPY any non-spam (ham) they find in their junkmail folder into their LearnAsHam folder.
This is a really efficient way to reduce impact of SPAM to your particular installation. Do not fear to run again files that are tagged as SPAM, as they will either get ignored if all their patterns are known, or the Bayes might catch one more pattern that could help you to get ride of the next incoming SPAM to even get accepted.
If you want, the code below counts how many e-mail are in LearnAsSpam and LearnAsHam directories (of all users). It's useful to know if your users are using those folders. However Learn will send you a report after each pass. If you are interested on the number of emails lefts in the junkmail directory without any attention, you could install smeserver-mailstats and activate the option to account for them
#!/bin/bash
# ContaLearn.sh
#for compatibility with older versions without rpm, testing
[ `/sbin/e-smith/db configuration getprop LearnAsSpam dir` ] &&
LearnAsSpam=`/sbin/e-smith/db configuration getprop LearnAsSpam dir` || LearnAsSpam='LearnAsSpam';
[ `/sbin/e-smith/db configuration getprop LearnAsHam dir` ] &&
LearnAsHam=`/sbin/e-smith/db configuration getprop LearnAsHam dir` || LearnAsHam='LearnAsSpam';
JunkMail='junkmail';
echo
date
declare -i tspam
declare -i tham
declare -i tleft
declare -i tnseen
printf "%-25s %-11s %-11s %-11s %-11s \n" "User" "LearnAsSpam" "LearnAsHam" "JunkMail" "NotSeen"
pushd /home/e-smith/files/users/ >>/dev/nul
for u in `ls ` #| grep -v admin`
do
[ "$u" = "admin" ] && mailpath="/home/e-smith/" || mailpath="/home/e-smith/files/users/$u" ;
spam=`ls -1 $mailpath/Maildir/.$LearnAsSpam/cur |wc -l`
ham=`ls -1 $mailpath/Maildir/.$LearnAsHam/cur |wc -l`
left=`ls -1 $mailpath/Maildir/.$JunkMail/cur |wc -l`
nseen=`ls -1 $mailpath/Maildir/.$JunkMail/new |wc -l`
if [[ $spam > 0 ]] || [[ $ham > 0 ]] || [[ $left > 0 ]] || [[ $nseen > 0 ]]; then
printf "%-25s %-11d %-11d %-11d %-11d \n" $u $spam $ham $left $nseen
fi
tspam=$tspam+$spam
tham=$tham+$ham
tleft=$tleft+$left
tnseen=$tnseen+$nseen
done
echo "----------------------------------------------------------------------"
printf "%-25s %-11d %-11d %-11d %-11d \n" "Total:" $tspam $tham $tleft $tnseen
echo
popd >>/dev/nul
Learn Contrib
The Learn contrib was intended to install and configure the bayes training tools LearnAsSpam & LarnAsHam.
Reset the Bayes Database
Based on this forum post http://forums.contribs.org/index.php/topic,50712.msg258844.html#msg258844 it may be advantageous to remove the bayes database every few years & recreate it, in order to improve spam filtering performance.
Follow these instructions to turn bayes OFF, delete the database, create an empty database, and turn bayes back on:
config setprop spamassassin UseBayes 0 signal-event email-update 'rm' /var/spool/spamd/.spamassassin/bayes*
config setprop spamassassin UseBayes 1 expand-template /etc/mail/spamassassin/local.cf sa-learn --sync --dbpath /var/spool/spamd/.spamassassin -u spamd chown spamd.spamd /var/spool/spamd/.spamassassin/bayes_* chown spamd.spamd /var/spool/spamd/.spamassassin/bayes.mutex chmod 640 /var/spool/spamd/.spamassassin/bayes_* signal-event email-update
The Sonora Communications "Spam Filter Configuration for SME 7" howto
http://www.sonoracomm.com/support/19-inet-support/49-spam-filter-configuration-for-sme-7
GeoIP: spam blocking based on geographical information
The GeoIP plugin for Spamassasin lets us know where our mail server is receiving mail from. If we're receiving too much spam from a particular location, this will help track it down. We can then use that info to reject connections from that place taking the load off our server.
You can find information how to install and use it on the GeoIP page.
Anti Virus
SME Server uses Clam AntiVirus (http://www.clamav.net) as the default and built-in anti virus engine.
Signatures
By default SME Server will automatically get virus signature database updates from ClamAV.
Other people and organizations have developed additional signatures which can also be used with ClamAV to provide extra protection. Databases of these signatures can be downloaded and installed on SME Server, and used by ClamAV
In order to automate the download and installation of the additional databases, as well as control which databases you use, follow the instruction in the Virus:Additional Signatures Howto
Heuristic Scan
HeuristicScanPrecedence is a new option in clamav 0.94.
When enabled, if a heuristic scan (such as phishingScam) detects a possible virus/phish it will stop scan immediately. Recommended, saves CPU scan-time.
To enable this feature:
config setprop clamav HeuristicScanPrecedence yes expand-template /etc/clamd.conf sv t clamd
Default is disabled.
Attachment Filtering
The functionality to block possible executable and virus files attached to emails has been incorporated into SME Server v7.x. See the Email panel in server manager.
Additional file signature patterns can be added to the SME defaults. See the Virus:Email Attachment Blocking Howto for further information
Email Clients
"concurrency limit reached" when using IMAP
Sometime shows as Thunderbird giving this error message, This Mail-server is not a imap4 mail-server
To workaround thunderbirds limitations change, this thunderbird setting to false
- Preferences, Advanced, Config editor (aka about:config): filter on tls.
- set security.enable_tls to false
If the total concurrency limit is reached, it'll look like this in /var/log/dovecot/current:
@400000005a1c2c1f19c9381c master: Warning: service(imap): process_limit (2) reached, client connections are being dropped
@400000005a1c2c291a4712dc imap-login: Error: read(imap) failed: Remote closed connection (destination service { process_limit } reached?)
@400000005a1c2c291a471aac imap-login: Error: read(imap) failed: Remote closed connection (destination service { process_limit } reached?)
For the per IP concurrency limit, it'll be like this:
@400000005a1c2c6214542b94 imap-login: Info: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=2): user=<someone>, method=PLAIN, rip=192.168.x.y, lip=192.168.z.t, TLS, session=<abcdefgh>
@400000005a1c2c6233f1bcb4 imap-login: Info: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=2): user=<someone>, method=PLAIN, rip=192.168.x.y, lip=192.168.z.t, TLS, session=<ijklmnop>
The following commands will give your the current value:
db configuration getprop imap ConcurrencyLimit || echo 400 db configuration getprop imap ConcurrencyLimitPerIP || echo 12
You can also increase the ConcurrencyLimitPerIP and/or ConcurrencyLimit value for imap and/or imaps (secure)
config setprop imap ConcurrencyLimitPerIP 20 config setprop imaps ConcurrencyLimitPerIP 20 signal-event post-upgrade; signal-event reboot
To see configuration:
config show imap
tail -f /var/log/dovecot/current | tai64nlocal #out of date
More detail can be found here or here.
Mail server is not an IMAP4 mail server
This is a bug in Thunderbird, the previous tips may help
The Bat
The gives this error message, but they are wrong.
"This server uses TLS v3.0 which is considered to be obsolete and insecure.
The server must use TLS v3.1 or above."
Outlook/Outlook Express give error 10060/0x800CCC90
Most likely OUTLOOK (EXPRESS) isn't configured correctly.
-open OUTLOOK -click TOOLS > ACCOUNTS -click CHANGE (on the right-hand side) -find INCOMING MAIL SERVER & OUTGOING MAIL SERVER (on right-hand side) -type: mail.yourdomain.tld (in both places) -click MORE SETTINGS (on bottom-right) -click OUTGOING SERVER tab (at the top) -checkmark "MY OUTGOING SERVER REQUIRES AUTHENTICATION" -bullet "USE SAME SETTINGS AS INCOMING MAIL SERVER" -click ADVANCED tab (at the top) -find OUTGOING SERVER -checkmark "THIS SERVER REQUIRES A SECURE CONNECTION" (under outgoing server) -change 25 to 465 -[possibly required, secure IMAP is 993] -click OK > NEXT > FINISHED -you're finished, your email should work now
Outlook 2013 on Windows 10 gives "An unknown error occurred, error code 0x8004011c" when attempting an IMAP connection for a DOMAIN user
This is a known issue with the above combination of Windows and Outlook version as of 2015-02-18 (see: Bug 9618).
The following registry key resolves the issue: To work around this problem, set the value of the ProtectionPolicy registry entry to 1 to enable local backup of the MasterKey instead of requiring a RWDC in the following registry subkey:
[HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb] "ProtectionPolicy"=dword:00000001
The PortectionPolicy entry may need to be created
Outlook 2013 on Windows 8.1 gives error 0x800CCC1A when sending over SMTP port 465
This is a known issue with the above combination of Windows and Outlook version as of 2015-02-18 (see: Bug 8854).
The following client-side workaround has been suggested on the dovecot mailinglist:
Disable TLS1.2 on the Windows 8.1 client, using a registry entry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS1.2\Client] "DisabledByDefault"=dword:00000001 "Enabled"=dword:00000000
If the registry entry above does not exist on your system, you will have to create it manually.
Whether this is OpenSSL or Microsoft's "fault" is currently not answered.
Outlook test message doesn't come through
You clicked the TEST ACCOUNT SETTINGS in OUTLOOK didn't you? This is a bug in OUTLOOK. The test message sends a test email with 'no Date header'. As the name suggests, this means a message without any date. Since the server doesn't accept mail with 'no Date header' (because it's required) the message is rejected. To test, send an actual message from OUTLOOK.
If you want, you can try THUNDERBIRD. It's like OUTLOOK but made by a different company. It's completely free and works very well at home and at the office.
I can't receive/send email from my application (ACT!, vTiger, MS Outlook, etc)
Most likely, this is a bug the application you're using and not a problem with the SMESERVER. The application sends an email with 'no Date header'. As the name suggests, this means a message without any date. Since the server doesn't accept mail with 'no Date header' (because it's required) the message is rejected.
As a workaround you can disable the check for the 'Date header'. To disable this check on the internal interface:
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local cd /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local echo "# 17check_basicheaders disabled by custom template" > \ 17check_basicheaders signal-event email-update
To disable this check for the external interface:
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0 cd /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0 echo "# 17check_basicheaders disabled by custom template" > \ 17check_basicheaders signal-event email-update
After I upgrade my SME Server, my email folders have disappeared when using IMAP
After upgrade, if there are missing IMAP folders, the client may need to re-subscribe to folders. This may affect either webmail users or users who use an IMAP email client.
Entourage: Using SME's Self-Signed Certificate for SSL Connections from Entourage on OS X 10.4
The main problem here is that Entourage will only support trusted, PEM Base-64 Encoded certificates. To use IMAPS or SMTPS from Entourage with your SME server, you will need to:
1. Login to your Mac as a user with administrative privileges 2. Open Safari and browse to https://smeserver/server-manager. When you receive the warning about your certificate: - click on "Show Certificate" - click and drag the gold-rimmed image of a certificate to your desktop. You will now have myserver.mydomain.tld.cer on your desktop. 3. Locate and open the Microsoft Cert Manager - "Import" the certificate you downloaded in step 2. 4. Highlight the imported certificate and "Export" it. - Select the "PEM..." format - add "pem." to the beginning of the filename - export it to your Desktop 5. Double-click on the new pem.myserver.mydomain.tld.cer - Apple's Keychain Access application will open. - Select the X509Anchors Keychain and click "OK" 6. While still in Apple's Keychain Access, select the "Certificates" category - Drag pem.myserver.mydomain.tld.cer into the certificates window.
You should now be able to connect to your SME from your Entourage using IMAPS.
If you are accessing your SME server using a different name than the one encoded in the certificate you will still receive a security warning from Entourage, but "OK" will now grant access to your folders.
Notes:
- Procedure mostly taken from http://www.kerio.com/manual/kmsug/en/ch09s06.html
- I still get various other IMAP errors due, I suspect, to the "concurrency limit reached" issue.
- Click on "Show Keychains" in Apple's "Keychain Access" if you need to delete a certificate and try again.
How do I get my e-mail to show the correct From Address
The From address on an e-mail is not supplied by the server. It is supplied by the e-mail client.
- Configure your Account in your e-mail client with the correct FROM address.
- You can change the FROM address in webmail with the following:
- Login to webmail as the user, go to options-personal information and change the identity to have the correct FROM address. You can have multiple identities with a single user.
Some system generated email is created by the server, some contribs may send mail externally, in these cases you need a valid domain name for the server, buy one or use a free provider like dyndns.org
Server Settings
qmail ConcurrencyLocal
The default value for /var/qmail/control/concurrencylocal is 20. This setting controls the maximum amount of simultaneous local deliveries.
There is a optional database property (does not show unless changed from the default setting) called ConcurrencyLocal for qmail in the config database. The ConcurrencyLocal property changes the value stored in /var/qmail/control/concurrencylocal.
It can be set, for example to decrease the local concurrency limit
config setprop qmail ConcurrencyLocal 6 signal-event email-update
qmail ConcurrencyRemote
The default value for /var/qmail/control/concurrencyremote is 20. This setting controls the maximum amount of simultaneous remote deliveries.
There is a optional database property (does not show unless changed from the default setting) called ConcurrencyRemote for qmail in the config database. The ConcurrencyRemote property changes the value stored in /var/qmail/control/concurrencyremote.
It can be set, for example to decrease the remote concurrency limit
config setprop qmail ConcurrencyRemote 10 signal-event email-update
Refer also this comment by CB
http://forums.contribs.org/index.php/topic,50091.msg251320.html#msg251320
How long retry before return e-mail as undeliverable
To configure how long SME server will try to delivery a message before return a permanent error
mkdir -p /etc/e-smith/templates-custom/var/qmail/control echo 172800 > /etc/e-smith/templates-custom/var/qmail/control/queuelifetime expand-template /var/qmail/control/queuelifetime sv t qmail
The default value is 604800 seconds, or one week.
The example above shows 172800 seconds, or two days (a weekend for infra upgrade!)
source: http://forums.contribs.org/index.php/topic,47471.0.html
Double bounce messages
To stop admin receiving double bounce messages
config setprop qmail DoubleBounceTo someoneuser signal-event email-update
Or just delete them. You risk losing legitimate double bounces (which are rare, but you want to look at them when they do occur)
config setprop qmail DoubleBounceTo devnull signal-event email-update
see a longer explaination here
Keep a copy of all emails
You may need to keep a copy of all emails sent to or from your email server. This may be for legal, or other reasons.
The following instructions will create a new user account (default is maillog) and forward every email that goes through your SME server to it.
First, log onto the server-manager and create the user maillog
Go to the SME Command Line (logon as root) and issue the following commands:
config setprop qpsmtpd Bcc enabled signal-event email-update
Optionally make the forwarding of the emails invisible to the end user. Without it, there will be an X-Copied-To: header in each email. Run this command before the signal-event
config setprop qpsmtpd BccMode bcc
If you want to view the emails, point your email client at the SME and log on as maillog.
You can modify the default user:
config setprop qpsmtpd BccUser someuser
Keep a copy of outgoing emails only
In addition to the commands in the previous section we will also have to create a custom template as follows:
Log in as root or a user with root privileges
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/ cp /etc/e-smith/templates/var/service/qpsmtpd/config/peers/0/13bcc /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/ cd /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/ nano -w 13bcc
change the code to:
{
return "# bcc disabled" unless ($qpsmtpd{Bcc} eq "enabled");
return "bcc mode " . $qpsmtpd{BccMode} . " outgoing " . $qpsmtpd{BccUser};
}
Save by pressing Ctrl x at the same time and confirm with y
Then enable the changes with
signal-event email-update
More info:
perldoc /usr/share/qpsmtpd/plugins/bcc
Set Helo hostname
Default is set to the hostname.domain, but sometime you might want to have something else to answer with the same as your reverseDNS. You can do one of the followings to only adjust the helo name:
config setprop smtpd HeloHost mydomainname signal-event email-update
or the following to adjust the way your server will present itself everywhere (httpd, qpsmtd...) This might trigger the generation of new ssl certificate, so use it only if you are sure this is what you want to do.
config set DomainName mydomainname signal-event domain-modify signal-event email-update
Set max email size
- IMPORTANT:
bugzilla: 7876points out that if your system has /var/service/qpsmtpd/config/databytes it should be deleted. (Fixed as of smeserver-qpsmtpd-2.4.0-7.el6.sme.noarch - seebugzilla: 8329).
There are several components involved in sending email on a SME server. Each component has a size limit that may affect an email message that passes through the server.
Be aware that email size is not the same thing as attachment size. Binary attachments to email are encoded using techniques that result in email sizes that can be as much as 30% larger than the original attachment. Most major email clients (Thunderbird, Apple Mail, Outlook) allow you to enable a "message size" column in the message list that will show you the size of your email messages (More).
| Subsystem | Function | Default Limit | Command to change size | Notes |
|---|---|---|---|---|
| qmail | Delivers email to local mailboxes and to remote servers | 15000000 | config setprop qmail MaxMessageSize xx000000 | Value is in BYTES. 15000000 equals approximately 15MB. No value means no limit. |
| clamav | Used to scan emails and attachments | 15M | config setprop clamav MaxFileSize 15M | Value includes human-readable abbreviations. "15M" equals 15 MegaBytes. |
| qpsmtpd | The clamav plugin to qpsmtpd is called with a specified size limit. | 25000000 | config setprop qpsmtpd MaxScannerSize xx000000 | Value is in BYTES. Question: does this value override the setting of 'MaxFileSize', or will the smaller value prevail? |
| php | The php maximum file upload size will determine the largest file you can attach to an email message using horde (or any other php email client) | 10M | config setprop php UploadMaxFilesize 10M |
clamav
A note about clamav:
ClamAV includes settings to prevent the scanning of archives that could cause problems if fully expanded; if an attachment cannot be scanned, it will be rejected.
In order for changes to take effect, run:
signal-event email-update
These attributes could result in the rejection of a compressed attachment on a SME server:
- ArchiveMaxCompressionRatio (default 300)
- MaxFiles (default 1500)
- MaxRecursion (default 8)
spamassassin
By default the qpsmtpd 'spamassassin' plugin does not pass any messages over 500,000 bytes to spamassassin for scanning.
To change this behavior:
db configuration setprop spamassassin MaxMessageSize 2000000
increases message size to 2,000,000 bytes. Apply the change with
signal-event email-update
Change Horde Webmail Login Page 'Welcome To' Title
The login page for Webmail defaults to "Welcome to Horde Webmail". In order to change this to something like "Welcome to MyDomain Mail"
config setprop horde Name "MyDomain Mail" signal-event email-update
See also:
Other configurable Horde settings DB_Variables Configuration#Horde_(webmail)
Forum post 31093
Add the admin user as an administrator for Horde
config setprop horde Administration enabled signal-event email-update
Large attachments not displaying in webmail
Due to limits set in the PHP configuration it might be that webmail will not display large attachments (see also bugzilla:3990). The following entries are related to the error and can be found in the log files:
/var/log/messages
Mar 13 00:00:12 box1 httpd: PHP Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 154 bytes) in /home/httpd/html/horde/imp/lib/MIME/Contents.php on line 173
/var/log/httpd/error_log
Allowed memory size of 33554432 bytes exhausted (tried to allocate 0 bytes)
The default MemoryLimit setting in PHP is set to 32M the value can be changed using the commands below replacing XX with the value you desire.
db configuration setprop php MemoryLimit XXM expand-template /etc/php.ini sv t httpd-e-smith
Disable mail to a user from an external network
However, this seems to only affect /var/qmail/control/badrcptto - denying external delivery to your users but allowing outbound emails: http://forums.contribs.org/index.php?topic=40449.5
Can be either a user, pseudonym or group
db accounts setprop groupname/username Visible internal signal-event email-update
If you want to remove
db accounts delprop groupname/username Visible signal-event email-update
- If you need to restrict emails for all users you can perform this command line
db accounts show | awk -F "=" '/\=user/ {print $1}' |while read USER; do db accounts setprop $USER Visible internal; done
signal-event email-update
If you want to remove
db accounts show | awk -F "=" '/\=user/ {print $1}' |while read USER; do db accounts delprop $USER Visible; done
signal-event email-update
I can't receive mail at: user@mail.domain.tld
Add mail.domain.tld as a virtualdomain.
-login to SERVER-MANAGER -click DOMAINS (on the left) -click ADD -type: mail.domain.tld
How do I find out who is logged into webmail and what IP number.
This is logged is in /var/log/messages.
How do I enable smtp authentication for users on the internal network
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local cd /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local cp /etc/e-smith/templates/var/service/qpsmtpd/config/peers/0/05auth_cvm_unix_local . signal-event email-update
(note the "." at the end of the 3rd line)
Authentication for the local network will now follow the setting of config::qpsmtpd::Authentication
ie do
config setprop qpsmtpd Authentication enabled signal-event email-update
How do I disable SMTP relay for unauthenticated LAN clients
http://forums.contribs.org/index.php?topic=38797.msg176490#msg176490
- Enable smtp authentication as shown above
- Disable un-authenticated smtp relay for the local network(s)using:
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/relayclients echo "# SMTP Relay from local network denied by custom template" >\ /etc/e-smith/templates-custom/var/service/qpsmtpd/config/relayclients/80relayFromLocalNetwork signal-event email-update
- Configure your email clients to use smtps with authentication:
- change outgoing smtp port to 465 and select SSL
- enable Authentication against the outgoing mail server
Allow SMTP relay of mail without encryption/authentication
Change the configuration of the system from the default, so that it no longer requires encryption/authentication before allowing relaying of mail.
Disable smtp authentication as shown in Bugzilla: 6522
config setprop qpsmtpd RelayRequiresAuth disabled signal-event email-update
SMTP Authentication TLS before Auth disable & enable
Since SME v7.5 the default for SMTP Authentication is 'requires TLS before Auth' to increase security. Where a SME7.4 or earlier server with SMTP & SSMTP authentication enabled has been upgraded, users are now unable to send mail. Users will need to enable TLS or Auto for the Authentication encryption setting in their email clients. Some older email clients and devices do not support TLS.
A fix was released in SME7.5.1 to allow this setting to be disabled (ie revert to SME7.4 functionality). Upgrade to SME7.5.1 before using these commands.
To disable this (AUTH without TLS) & revert to SME7.4 defaults do
config setprop qpsmtpd TlsBeforeAuth 0 signal-event email-update
To change back to the sme7.5 & greater default (AUTH with TLS) do
config setprop qpsmtpd TlsBeforeAuth 1 signal-event email-update
See http://forums.contribs.org/index.php/topic,46218.0.html
http://bugs.contribs.org/show_bug.cgi?id=5997
Internet provider's outgoing port 25 is blocked: How to set an alternative outgoing port for the SMTP server
If your Internet provider is blocking outgoing smtp port 25 on your internet connection but your provider is offering an alternative outgoing port (or when using some relay service) you can simply set this alternative port by adding it to the 'Address of Internet provider's mail server' value in the 'E-mail delivery settings' screen of the server-manager like this:
<internet providers mail server name or ip-address>:<alternative port>
For example: mail.mydomain.com:587
This setting does not alter the incoming smtp mail server port on SME server, which will still use port 25. Refer to a workaround in http://wiki.contribs.org/PortRedirect
How do I enable and configure a disclaimer in email messages
A disclaimer message can be added to the footer of all outgoing email messages.
The message can be the same for all domains or it can be different for all domains.
This functionality is part of sme7.2 release so make sure you have upgraded before doing this.
To create a general disclaimer for all domains on your sme server
config setprop smtpd disclaimer enabled nano -w /service/qpsmtpd/config/disclaimer
Enter the required disclaimer text
To save & exit
Ctrl o Ctrl x
To make the changes take effect
signal-event email-update
To create domain specific disclaimers, create seperate domain based disclaimer text files
Delete the general (all domains) disclaimer file if you have already created it
rm /service/qpsmtpd/config/disclaimer config setprop smtpd disclaimer enabled nano -w /service/qpsmtpd/config/disclaimer_domain1.com.au nano -w /service/qpsmtpd/config/disclaimer_domain2.com nano -w /service/qpsmtpd/config/disclaimer_domain3.org
Enter the required text in each disclaimer file
To save & exit
Ctrl o Ctrl x
After making any changes remember to do
signal-event email-update
Note if you only wish to have a disclaimer for some domains, then only create a disclaimer text file for those domains
Note also the criteria for when a disclaimer is attached
(see http://bugs.contribs.org/show_bug.cgi?id=2648)
eg a disclaimer is added to internal to external messages but not internal to internal messages.
There are also various switches that can be applied
(see http://bugs.contribs.org/show_bug.cgi?id=2648).
To disable the disclaimer function for all domains on your sme server
config setprop smtpd disclaimer disabled signal-event email-update
Email WBL server manager panel
There is a server-manager contrib to allow GUI control of email white and black lists, detailed in the wiki article: Email_Whitelist-Blacklist_Control.
The panel allows easy configuration of functionality that is built into qmail, qpsmtpd and spamassassin. For more information google for qmail & qpsmtpd, read the spamassassin section in this wiki article and see Email#Default_Plugin_Configuration default qpsmtpd plugin confguration).
There are two main sections, Blacklist and Whitelist, where you can control settings.
Note that there are subtle differences in syntax between whitelist and blacklist entries
Blacklist - Black lists are used for rejecting e-mail traffic
DNSBL status - DNSBL is an abbreviation for "DNS blacklist".
It is a list of IP addresses known to be spammers.
RHSBL status - RHSBL is an abbreviation for "Right Hand Side Blacklist".
It is a list of domain names known to be spammers.
qpsmtpd badhelo - Check a HELO message delivered from a connecting host.
Reject any that appear in badhelo during the 'helo' stage.
qmail badmailfrom - Check envelope sender addresses.
Reject any that appear (@host or user@host) in badmailfrom during the 'mail'
stage.
spamassassin blacklist_from - Any envelope sender of a mail (*@host or user@host) matching an
entry in blacklist_from will be rejected by spamassassin.
Whitelists - White lists are used for accepting e-mail traffic
Whitelists status - White Lists: ACCEPT
qpsmtpd whitelisthosts - Any IP address listed in whitelisthosts will be exempted
from any further validation during the 'connect' stage.
qpsmtpd whitelisthelo - Any host that issues a HELO matching an entry in whitelisthelo
will be exempted from further validation during the 'helo' stage.
qpsmtpd whitelistsenders - Any envelope sender of a mail (host or user@host) matching an
entry in whitelistsenders will be exempted from further validation
during the 'mail' stage.
spamassassin whitelist_from - Any envelope sender of a mail (*@host or user@host) matching an
entry in whitelist_from will be exempted from spamassassin rejection.
How to block email from one address to another address with check_badmailfromto plugin
Enable the check_badmailfromto plugin. Adapted from this Forum post
This is based heavily on the similar check_badmailfrom, but this plugin references both the FROM: and TO: lines, and if they both are present in the badmailfromto config file (a tab delimited list of FROM/TO pairs), then the message is blocked as if the recipient (TO) didn't exist. This is specifically designed to not give the impression that the sender is blocked (good for cases of harassment).
Prior SME9.2 : qpsmtpd check_badmailfromto plugin
To control mail from external locations to internal locations do
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0 mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins echo "check_badmailfromto" > /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31check_badmailfromto ln -s /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31check_badmailfromto /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/31check_badmailfromto signal-event email-update
To control mail sent from internal locations to internal locations, in addition to the above also do
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local ln -s /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31check_badmailfromto /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local/31check_badmailfromto signal-event email-update
Since SME9.2 : qpsmtpd badmailfromto plugin
remove previous templates, if you are updating
rm /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31check_badmailfromto \ /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/31check_badmailfromto \ /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local/31check_badmailfromto
To control mail from external locations to internal locations do
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0 mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins echo "badmailfromto" > /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31badmailfromto ln -s /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31badmailfromto /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/0/31badmailfromto signal-event email-update
To control mail sent from internal locations to internal locations, in addition to the above also do
mkdir -p /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local ln -s /etc/e-smith/templates-custom/var/service/qpsmtpd/config/plugins/31badmailfromto /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local/31badmailfromto signal-event email-update
For Qmail
Create and configure the badmailfromto custom template fragment
mkdir -p /etc/e-smith/templates-custom/var/qmail/control/badmailfromto nano -w /etc/e-smith/templates-custom/var/qmail/control/badmailfromto/template-begin
Type in the From and To pairs that you want to stop email delivery for, with a tab between them and a carriage return at the end of the line, with additional pairs on a new line ie
user@bad-domain.com tab user@yourdomain.com enter user@bad-domain2 tab user2@yourdomain enter
Note also that wildcards or blank spaces are not supported
eg
john@aol.com mary@yourdomain bill@yahoo.com paul@yourdomain.com
then save using
Ctrl o Ctrl x
Expand the template to update the /var/qmail/control/badmailfromto config file
expand-template /var/qmail/control/badmailfromto
Restart mail services
signal-event email-update
Redirect mail.domain.net to Webmail
Setup external dns records
Add mail.domain.net in Domains panel in server-manager
db domains setprop mail.dom.ain TemplatePath ProxyPassVirtualHosts ProxyPassTarget http://sme.dom.ain/webmail signal-event remoteaccess-update
where http://sme.dom.ain/webmail is servername.domainname/webmail
E-mail Retrieval
http://wiki.contribs.org/SME_Server:Documentation:Administration_Manual:Chapter13#E-mail_Retrieval
If your ISP does not provide a custom sort field and you experience the following errors occuring when Multidrop is enabled and the "Select Sort Method (for multi-drop)" is set to Default:
fetchmail: warning: multidrop for pop3.mypopserver.com requires envelope option! fetchmail: warning: Do not ask for support if all mail goes to postmaster!
and/or
fetchmail: warning: multidrop for my.isp.domain requires envelope option! fetchmail: warning: Do not ask for support if all mail goes to postmaster!
Set "Select Sort Method (for multi-drop) to 'Received' or 'for'
As described at bugzilla:5602 bugzilla:6483
Domain Authentication
Major mail hosting companies (Google, Yahoo, Microsoft) have made domain-authentication mandatory so as to not mark incoming mail as spam.
To facilitate this support for DomainKeys and DKIM signing needs to be enabled in SME's mail subsystem. These techniques require the adding of records in the DNS zone for the user's domain. The DKIM/DK/SPF/SenderID configuration has to be added to your your DNS server / registrar.
How do I remove an email address from the everyone group
By default, all users are automatically added to the user group "everyone". If you would like to remove a user from this group, connect to the server using SSH or locally log in to the server and issue the commands below. Be sure to substitute the name of the user you want to remove for the word username.
db accounts setprop username EveryoneEmail no signal-event user-modify /etc/init.d/qmail restart
How do I remove an email address from any regular group
By default, all users member of a group "group1" are automatically added as recipients of mail sent to group1@domain. If you would like to remove a user from this group, connect to the server using SSH or locally log in to the server and issue the commands below. Be sure to substitute the name of the user you want to remove for the word username.
db accounts setprop group1 EmailExcludeUsers tom,jack signal-event group-modify group1
If you want to prevent all the user members from another group "group2" from receiving emails addressed to group1@domain while they are also member of group1, you could connect to the server using SSH or locally log in to the server and issue the commands below. Be sure to substitute the name of the user you want to remove for the word username.
db accounts setprop group1 EmailExcludeGroups group2 signal-event group-modify group1
All members of the group will still be member for all other purpose (samba access to ibays as an example)
This behaviour is only available as per e-smith-qmail-2.4.0-7.sme see bug #9540
Change the number of logs retained for qpsmtpd and/or sqpsmtpd
The normal retention is 5 logs for both qpsmptd and sqpsmtpd. This may or may not fit all installations. This information is pulled from bugzilla.
Check your config to see if any change has been made to the default log retention rules. Note there are different rules for qpsmtpd and sqpsmtpd. You have to make changes to both as you require.
config show qpsmtpd
If the KeepLogFiles property isn't listed, the default rules apply. Determine how many logs you would like to keep and apply that to the following example. In the command below, 15 is used to keep 15 qpsmtpd logs.
db configuration setprop qpsmtpd KeepLogFiles 15
Restart multilog with the following.
sv t /service/qpsmtpd/log
Check that your setting saved.
ps aux | grep qpsmtpd | grep multi
Look for the line that ends with /var/log/qpsmtpd and verify the number after n equals your KeepLogFiles property from above.
DKIM Setup - qpsmtpd version<0.96
A plugin has been written and is available in SME
To activate it manually follow the steps below, or download a shell script that will do the server based stuff for you & guide you on the DNS stuff setup_dkim.sh:-
Note: I'd recommend reviewing the script first to make sure you're happy to run it on your system
Create a folder:
mkdir /var/service/qpsmtpd/config/dkimkeys/
Then:
cd /var/service/qpsmtpd/config/dkimkeys/ openssl genrsa -out dkim.private 1024 openssl rsa -in dkim.private -pubout -out dkim.public chown qpsmtpd:qpsmtpd -R /var/service/qpsmtpd/config/dkimkeys/ chmod 0700 dkim.private
For each domain you want to sign:
cp -a dkim.private <fully qualified domain name>.private (less the <> brackets)
Then create a template fragment:
mkdir --parent /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local echo "dkim_sign keys dkim">/etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local/69dkim_sign signal-event email-update
Finally propagate your public key "dkim.public" content (<key text>) to your DNS.
Check with your DNS server / registrar. Something similar to the following should work but it varies depending on provider - replace <fully qualified domain name> with your doman details e.g "mydomain.org" (less the <> brackets):
When extracting the key text from the dkim.public file it's on multiple lines. For the key to work for us in the DNS TXT record we need to exclude the header & footer lines & have just the key text as a single line string (the setup_dkim.sh script provides this info in the format required).
default._domainkey.<fully qualified domain name> IN TXT "k=rsa; p=<key text>; t=y"
With Zonedit the following works within your Zone :
Subdomain : default._domainkey
Type : TXT
Text : "v=DKIM1;k=rsa; p=<key text>; t=y"
If you want to customize the signing you can add parameters to the line in /etc/e-smith/templates-custom/var/service/qpsmtpd/config/peers/local/69dkim_sign. Parameters and value are separated by a space only.
- keys : "dk" or "domainkeys" for domainkey signature only, "dkim" for DKIM signature only, default "both" (n.b. above template example is dkim ONLY)
- dk_method : for domainkey method , default "nofws"
- selector : the selector you want, default "default"
- algorithm : algorithm for DKIM signing, default "rsa-sha1"
- dkim_method : for DKIM, default "relaxed"
NB: key files can not be defined in parameters, they need to be in /var/service/qpsmtpd/config/dkimkeys/{SENDER_DOMAIN}.private
See also : bugzilla:8251 bugzilla:8252
DKIM Setup - qpsmtpd version >= 0.96
Version 0.96 and above supports DKIM natively without the need for extra plugins.
All you have to do is to enable the DKIM signing and promulgate the DNS TXT entries to support it.
Enable the signing:
db configuration setprop qpsmtpd DKIMSigning enabled signal-event email-update
and then run:
qpsmtpd-print-dns <domain name>
to show the DNS entry(s) required.
Then you have to update your DNS.
also see bugzilla:9694 and https://wikit.firewall-services.com/doku.php/smedev/qpsmtpd_096#documentation
More details are available here
Incoming DKIM checking is also enabled out of the box.
In case you got a problem using the DKIM field provided with your DNS provider /registrar, please first contact them to ensure the problem is not how you try to enter the information. In the likelihood, you got "invalid field" or "too long field" errors and your provider is not able to help you or update its interface, you can generate a shorter DKIM key (with 1024 instead of the default 2048) this way:
cd /home/e-smith/dkim_keys/default mv private private.long mv public public.long openssl genrsa -out private 1024 openssl rsa -in private -pubout -out public chown qpsmtpd:qpsmtpd private chown root:qpsmtpd public chmod 0400 private signal-event email-update qpsmtpd-print-dns
Outbound DKIM signing / SPF / DMARC policy FOR MULTIPLE DOMAINS
The default DKIM key is created in /home/e-smith/dkim_keys/default. To enable DKIM signing for all the domains that you manage:
db configuration setprop qpsmtpd DKIMSigning enabled signal-event email-update
If you want to disable dkim signing for a domain, you can use:
db domains setprop domain.com DKIMSigning disabled signal-event email-update
The default behavior is to use the same key pair for all your domains. But you can create other key pairs for specific domain if you want. For example, if you want to use a specific key pair for the domain.net domain:
cd /home/e-smith/dkim_keys mkdir domain.net cd domain.net echo default > selector openssl genrsa -out private 2048 openssl rsa -in private -out public -pubout chown qpsmtpd:qpsmtpd private chmod 400 private signal-event email-update
Now, the emails using a domain.net sender address will be signed by this new key instead of the default one.
Domain Keys
There is a plugin to check incoming mail has been signed
Please read here for more details : http://bugs.contribs.org/show_bug.cgi?id=4569
Other information
DomainKeys seem to be deprecated in favour of DKIM.
The DomainKeys plugin only CHECKS incoming email. Spamassassin checks for DKIM.
Temporary_error_on_maildir_delivery
In certains cases you have some mailboxes which can't delivery messages and the qmail log say:
deferral: Temporary_error_on_maildir_delivery._(#4.3.0)/
It is probably that your users want to go beyond the upper limit of their quota, so you have to increase it. This could solve their problems.
External Access
Allow external IMAP mail access
There was a deliberate decision to remove non-SSL protected username/password services from the external interface.
to allow unsecure IMAP access
config setprop imap access public signal-event email-update
But before you do this try to use secure IMAP (IMAPS or imap over ssl) with port 993
POP3 & webmail HTTP
I want to set my SMESERVER to allow POP3 (or webmail HTTP) but it's not an option, I only see POP3S (or webmail HTTPS).
The SMESERVER is secure by design. POP3 (or webmail HTTP) is viewed as inadequate security and removed as an option from a standard installation to encourage unknowing administrators to select the 'best practice' option -a secure connection with POP3S, IMAPS, or HTTPS.
You can still set your SMESERVER to allow POP3 settings by:
config setprop pop3 access public signal-event email-update
Allow external pop3 access
Email settings > POP3 server access in SME 7.1 server-manager allows only pop3s protocol for clients outside the LAN. Some email clients (eg The Bat! v3.98.4) won't allow pop3s connections to SME 7.1 because of ssl version conflict. Until this is sorted out, a workaround is to hack SME to allow regular pop3 on the external interface using the following commands.
config setprop pop3 access public signal-event email-update svc -t /service/pop3s
more information bugzilla:2620
Imap
Folders with a dot in name
Email folder names that have a period ('.') in the folder name, will be split into sub-folders. e.g. folder name 'www.contribs.org' is created as
www
contribs
org
qpsmtpd
SME uses the qpsmtpd smtp daemon.
Official Description
qpsmtpd is a flexible smtpd daemon written in Perl. Apart from the core SMTP features, all functionality is implemented in small "extension plugins" using the easy to use object oriented plugin API.
qpsmtpd was originally written as a drop-in qmail-smtpd replacement, but now it also includes smtp forward, postfix, exim and maildir "backends".
qpsmtpd wiki: http://wiki.qpsmtpd.org
Log watching tool
qplogtail is a script to to monitor /var/log/qpsmtpd/current, see bugzilla:3418
Qpsmtpd for SME versions 9.1 and earlier
Default Plugin Configuration
SME uses the following qpsmtpd plugins to evaluate each incoming email.
SME maintains 2 distinct configurations: one for the 'local' networks (as defined in server-manager::Security::Local networks) and another for 'remote' networks (everyone else).
The default configuration of each plugin is indicated in the 'Default Status' column.
| Plugin | Purpose | Default Status |
|---|---|---|
| hosts_allow | Prohibit more than "InstancesPerIP" connections from any single host (change with 'config setprop smtpd InstancesPerIP'). Allow or deny connections according to the contents of /var/service/qpsmtpd/config/hosts_allow. See hosts_allow SVN code for more details. | enabled |
| peers | Allow different plugin configuration based on the sending computer's IP address. By default SME maintains different configurations for the local networks (in /var/service/qpsmtpd/config/peers/local) and for everyone else (in /var/service/qpsmtpd/config/peers/0) | enabled |
| logging/logterse | Allow greater logging detail using smaller log files. Optionally supports qplogsumm.pl to compile qpsmtpd statistics. | enabled |
| auth/auth_cvm_unix_local | Allow authenticated smtp relay | enabled (remote) disabled (local) |
| check_earlytalker | reject email from servers that talk out of turn | enabled (remote) disabled (local) |
| count_unrecognized_commands | reject email from servers that issue X invalid commands | enabled (remote) disabled (local) |
| bcc | bcc all email to a specific address for archiving | disabled |
| check_relay | Check to see if relaying is allowed (in case the recipient is not listed in one of SME's local domains) | enabled |
| check_norelay | Check to see if the sending server is specifically forbidden to relay through us. | enabled |
| require_resolvable_fromhost | Check that the domain listed in the sender's email address is resolvable | enabled (remote) disabled (local) |
| check_basicheaders | reject email that lacks either a From: or Date: header | enabled |
| rhsbl | Reject email if the sender's email domain has a reputation for disregarding smtp RFCs. | disabled (always disabled for local connections) |
| dnsbl | Reject email from hosts listed in your configured dnsbl servers | disabled |
| check_badmailfrom | Reject email where the sender address is listed in /var/service/qpsmtpd/config/badmailfrom | enabled |
| check_badrcptto_patterns | Reject email addressed to any address matching an expression listed in /var/service/qpsmtpd/config/badrcptto_patterns | enabled |
| check_badrcptto | Reject email addressed to any address listed in /var/service/qpsmtpd/config/badrcptto | enabled |
| check_spamhelo | Reject email from hosts that say 'helo ...' using a value in /var/service/qpsmtpd/config/badhelo | enabled |
| check_smtp_forward | If config show DelegateMailServer or db domains show <domainname> MailServer is set (telling SME to deliver email for all domains or just <domainname> to another server), check_smtp_forward will connect to the specified server and will reject the message outright if the internal mail server would also reject it. | disabled unless an internal mail server is configured. |
| check_goodrcptto | Accept email only if the recipient address matches an entry in /var/service/qpsmtpd/config/goodrcptto. For domains that are configured to use an internal mail server, the entire domain name will be added to .../goodrcptto. | enabled |
| rcpt_ok | Return 'OK' if none of the other host checks has returned 'DENY' (??) | enabled |
| pattern_filter | Reject email according to content patterns (??) | disabled |
| tnef2mime | Convert MS TNEF (winmail.dat) and uuencoded attachments to MIME | enabled |
| disclaimer | Add a configurable disclaimer to email messages | disabled |
| spamassassin | Check email using spamassassin, and optionally reject it completely if the score exceeds a configurable value. | disabled (always disabled for local connections) |
| virus/clamav | Scan incoming email with ClamAV | enabled |
| queue/qmail-queue | Deliver the incoming message to qmail for delivery. | enabled |
Qpsmtpd for SME versions 9.2 and Later
This section has been taken from the notes prepared by the dev who made the changes, the wiki is here.
Here is a list of the plugins in use, and a note of any changes that might have occurred:
- logterse: no change
- tls: no change
- auth_cvm_unix_local: no change
- check_earlytalker: renamed earlytalker
- count_unrecognized_commands: no change
- bcc: no change
- check_relay: renamed relay
- check_norelay: merged into the relay plugin
- require_resolvable_fromhost: renamed resolvable_fromhost
- check_basicheaders: renamed headers
- rhsbl: no change
- dnsbl: no change
- check_badmailfrom: renamed badmailfrom
- check_badrcptto_patterns: doesn't exist anymore, merged with badrcptto
- check_badrcptto: renamed badrcptto
- check_spamhelo: renamed helo
- check_smtp_forward: no change
- check_goodrcptto: no change
- rcpt_ok: no change
- pattern_filter: no change
- tnef2mime: no change
- spamassassin: no change
- clamav: no change
- qmail-queue: no change
Here is a section for each of the new plugins which are installed by default. The ones that have not changed are documented above.
Karma
The karma plugin tracks sender history. For each inbound email, various plugins can raise, or lower the "naughtiness" of the connection (eg, if SPF check passes, if the message is spammy etc...). For each host sending us email, the total number of connections, and the number of good and bad connections is recorded in a database. If a host as more bad than good connections in its history, emails will be rejected for 1 day. 3 settings are available for this plugin:
- Karma (enabled|disabled): Default value is disabled. Change to enabled to use the plugin
- KarmaNegative (integer): Default value is 2.
It's the delta between good and bad connection to consider the host naughty enough to block it for 1 day.
Eg, with a default value of two, a host can be considered naughty if it sent you 8 good emails and 10 bad ones - KarmaStrikes (integer): Default value is 3. This is the threshold for a single email to be considered good or bad.
Eg, with the default value of 3, an email needs at least 3 bad karmas (reaches -3) for the connection to be considered bad.
On the other side, 3 good karmas are needed for the connection to be considered good. Between the two, the connection is considered neutral
and won't be used in the history count
Example:
db configuration setprop qpsmtpd Karma enabled KarmaNegative 3 signal-event email-update
URIBL
The URIBL plugin works a bit like RHSBL, except that it checks domain names found in the body of the email. For each URI identified, the corresponding domain name can be submitted to a BL list (through DNS queries). Two settings are available:
- URIBL (enabled|disabled): Default is disabled. Set this to enabled to use the plugin
- UBLList: (Comma separated list addresses): Default value is multi.surbl.org:8-16-64-128,black.uribl.com,rhsbl.sorbs.net.
This can be the same as RBLList. You can also set bitmask to use for combined lists (in the default value, the bitmask is 8-16-64-128)
Example:
db configuration setprop qpsmtpd URIBL enabled UBLList multi.surbl.org,black.uribl.com signal-event email-update
Helo
Previously, the helo plugin was just checking for some known bad helo hostnames used by spammers (aol.com and yahoo.com). Now, it can check much more than that. This plugin is always enabled and has a single setting:
- HeloPolicy: (lenient|rfc|strict). The default value is lenient.
See https://github.com/smtpd/qpsmtpd/blob/master/plugins/helo for a description of the various tests done at each level
Example:
db configuration setprop qpsmtpd HeloPolicy rfc signal-event email-update
Inbound DKIM / SPF / DMARC
DMARC is a policy on top of DKIM and SPF. By default, SPF and DKIM are now checked on every inbound emails, but no reject is attempted. The dmarc plugin can decide to reject the email (depending on the sender policy). dkim and spf plugins are always enabled. dmarc has two settings:
- DMARCReject (enabled|disabled): Default value is disabled.
If set to enabled, the dmarc plugin can decide to reject an email (if the policy of the sender is to reject on alignment failure) - DMARCReporting (enabled|disabled): Default value is enabled.
If set to enabled, enable reporting (which is the r in dmarc). Reporting is a very important part of the DMARC standard.
When enabled, you'll record information about email you receive from domains which have published a DMARC policy in a local
SQLite database (/var/lib/qpsmtpd/dmarc/reports.sqlite).
Then, once a day, you send the aggregate reports to the domain owner so they have feedback.
You can set this to disabled if you want to disable this feature - SPFRejectPolicy (0|1|2|3|4): Default value is 0. Set the policy to apply in case of SPF failure when the sender hasn't published a DMARC policy.
Note: this is only used when no DMARC policy is published by the sender.
If there's a DMARC policy, even a "p=none" one (meaning no reject), then the email won't be rejected, even on failed SPF tests.
- 0: do not reject anything
- 1: reject when SPF says fail
- 2: reject when SPF says softfail
- 3: reject when SPF says neutral
- 4: reject when an error occurred (like a syntax error in SPF entry) or if no SPF entry is published
- Inbound DKIM checks are only used by DMARC. No reject solely based on DKIM is supported
Example:
db configuration setprop qpsmtpd DMARCReject disabled SPFRejectPolicy 2 signal-event email-update
Outbound DKIM signing / SPF / DMARC policy
Everything is now ready for you to sign your outbound emails, and publish your public key, as well as your SPF and DMARC policy. A default DKIM key is created in /home/e-smith/dkim_keys/default. To enable DKIM signing for all the domain you manage:
db configuration setprop qpsmtpd DKIMSigning enabled signal-event email-update
If you want to disable dkim signing for a domain, you can use:
db domains setprop domain.com DKIMSigning disabled signal-event email-update
The default behavior is to use the same key pair for all your domains. But you can create other key pairs for specific domain if you want. For example, if you want to use a specific key pair for the domain.net domain:
cd /home/e-smith/dkim_keys mkdir domain.net cd domain.net echo default > selector openssl genrsa -out private 2048 openssl rsa -in private -out public -pubout chown qpsmtpd:qpsmtpd private chmod 400 private signal-event email-update
Now, the emails using a domain.net sender address will be signed by this new key instead of the default one.
Publishing your DNS entries
Signing your outbound emails is just part of the process. You now need to publish some DNS entries so everyone can check if the email they receive matches your policy. This part is not to be done on your SME Server, but on your public DNS provider. A script helps you by creating some sample DNS entries already formatted for a bind-like zone file. To use it:
qpsmtpd-print-dns <domain name>
If omitted, the primary domain name is assumed.
Example output:
Here are sample DNS entries you should add in your public DNS The DKIM entry can be copied as is, but others will probably need to be adjusted to your need. For example, you should either change the reporting email adress for DMARC (or create the needed pseudonym) default._domainkey IN TXT "v=DKIM1; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs/Qq3Ntpx2QNdRxGKMeKc2r9ULvyYW633IbLivHznN9JvjJIbS54PGIEk3sSxvZSdpTRAvYlxn/nRi329VmcDK0vJYb2ut2rnZ3VO3r5srm+XEvTNPxij5eU4gqw+5ayySDjqzAMEMc5V7lUMpZ/YiqnscA075XiMF7iEq8Quv1y0LokmgwtxzOXEZap34WXlKyhYzH+D""fabF6SUllmA0ovODNvudzvEOanPlViQ7q7d+Mc3b7X/fzgJfh5P9f5U+iSmzgyGctSb6GX8sqsDMNVEsRZpSE3jd2Z33RDWyW21PGOKB/ZrLiliKfdJbd3Wo7AN7bWsZpQsei2Hsv1niQIDAQAB" @ IN SPF "v=spf1 mx a -all" @ IN TXT "v=spf1 mx a -all" _dmarc IN TXT "v=DMARC1; p=none; adkim=s; aspf=r; rua=mailto:dmarc-feedback@domain.net; pct=100"
All you have to do now is publish those records, but do note that there is a point to consider when publishing the default._domainkey DNS record, as produced by the qpsmtpd-print-dns command: if the DNS record includes ;t=y then as per the DKIM specification (RFC4781 section 3.6.1) this means that your "...domain is testing DKIM. Verifiers MUST NOT treat messages from signers in testing mode differently from unsigned email, even should the signature fail to verify. Verifiers MAY wish to track testing mode results to assist the signer."
On the other hand, if no ;t=y is included, then it means you are intending to use DKIM in production mode. It might be a good idea to publish the DKIM DNS record first in testing mode (;t=y included), check how things go and if everything is alright, remove the ;t=y part.
Testing
You can install spfquery:
yum --enablerepo=epel install libspf2 libspf2-progs
Usage (try -help for help):
spfquery -ip=11.22.33.44 -sender=user@aol.com -helo=spammer.tld
Check rcord via dig
dig -t TXT +short impamark.co.uk
Load
The loadcheck plugin can temporarily deny inbound emails if your server is overloaded. This plugin is always enabled and has a single setting:
- MaxLoad (int number): Default is 7. If your load is above this value, emails from the outside will be deferred.
Other QPSMTPD Plugins
The following qpsmtpd plugins will work on a SME server, but are either not included or are not configured by default.
| Plugin | Purpose | Default Status |
|---|---|---|
| connection_time | Track the total time for each qpsmtpd connection from 'Accepted connection' through 'click, disconnecting', and output the results to the qpsmtpd log file. | not installed - not clear if this works for SME9.2 (anyone?) |
| GeoIP | Track the geographic origin of incoming email and optionally reject email from specified countries | not installed - does work for SME 9.2 and later. |
Internal or External Mail Servers
SME can be configured as a spam and antivirus filter for one or more "Internal or External" mail servers on a domain-by-domain basis. The mail server specified does not have to be on the same local network as your SME server, & can be hosted on an external site.
Deliver ALL email to a single internal or external mail server
You can set the default delivery location for all domains on your SME server to a single internal or external mail server by setting the mail server address in server-manager::Configuration::E-mail::Change e-mail delivery settings::Address of internal mail server.
Note: Address of internal mail server must be blank if you want any email delivered to the SME server itself.
Deliver email for one domain to an internal or external mail server
You can override the default email delivery destination for individual domains on your SME server (forwarding all email for the specified domain to another server) as follows:
First, create the necessary virtual domains using server-manager::Configuration::Domains::Add Domain.
Then, (assuming your domain is called test.com and the actual mail server is at a.b.c.d issue the following commands:
db domains setprop test.com MailServer a.b.c.d signal-event email-update
A FQDN can also be used for the MailServer property, eg aspmx.l.google.com instead of the IP address a.b.c.d
db domains setprop test.com MailServer aspmx.l.google.com signal-event email-update
Remove the internal or external mail server (and return email delivery for test.com to the default for your SME server) using:
db domains delprop test.com MailServer signal-event email-update
Secondary/Backup Mail Server Considerations
Many people misunderstand the issues of using a secondary or backup mail server (backup MX) to hold your mail before it gets delivered to your SME Server. If you consider putting a backup mail server in place because you are concerned about lost mail because your internet connection may occasionally drop out, think again and consider the issues discussed below.
What is Backup MX
A backup MX is a system whereby through your DNS records you tell other servers on the internet that in order to deliver mail to your domain they first need to try the primary MX record and if they fail to connect they can try to connect to one or more of your listed backup or secondary mail servers. See also http://en.wikipedia.org/wiki/MX_record
The process of delivering email to your SME Server
So lets look at how mail gets delivered without and with a backup mx when your Internet link, ISP or server is down.
Without a backup MX
- The sending mail server cannot connect to your server.
- The sending mail server MUST queue the mail and try again later.
- The mail stays on the sender's server.
- The sender's server resends the mail at a later date.
The requirement to re-queue is a fundamental part of the SMTP protocol - it is not optional. So, if your server is offline due to a link or ISP outage, the mail just stays at the sender's server until you are once again reachable.
With a backup MX
- The sending mail server cannot contact your server.
- The sending mail server sends the mail to your secondary MX.
- The secondary MX queues the mail until your link/server is up.
- The mail is queued on an untrusted third-party mail server (think about confidential mail between your company and some business partner).
- The sending mail server's administrator thinks it has been delivered, according to their logs.
- You have no, or little, visibility over the queued mail.
- When your link comes up, the secondary MX sends the mail on to your server.
- You have added more hops, more systems and more delay to the process.
If you think that a backup MX will protect against broken mail servers which don't re-queue, you can't. Those servers will drop mail on the floor at random times, for example when their Internet link is down.
Those servers are also highly likely to never try your backup MX.
Thankfully those servers are mostly gone from the Internet, but adding a secondary MX doesn't really improve the chances that they won't drop mail destined for your server on the floor.
Backup MX and SPAM Filtering
On top of the issue, indicated above, there is another issue to consider and that is what happens with SPAM due to the use of a Backup MX.
Your SME Server takes care of filtering a lot of SPAM by checking on the full username & domain at the time it is received.
For example if your server hosts example.com and someone sends mail to joeuser@example.com, the server will only accept the mail if joeuser is a local user/alias/group/pseudonym on the server. Otherwise, the mail is rejected during the SMTP transaction.
A backup mail server however, generally does not have a full list of users against which it can check if it should accept the mail for the given domain. Hence it will accept mail for invalid users.
So:
- If you trust the secondary MX, you will accept a lot of SPAM when the link comes up.
- If you don't trust it, you will cause a lot of SPAM backscatter as the mail has been accepted at the secondary MX and then later bounced by you.
- Stopping backscatter is why SME Server rejects invalid addresses during the initial SMTP transaction.
The SPAM backscatter can only be stopped if the secondary MX has a full list of users for your domain to allow filtering to occur.
But:
- You need to be able to configure this secondary MX with such user/domain lists
- You need to maintain these secondary configurations when users are added/deleted from your primary server configuration
- You need to test (regularly) if the secondary is successfully accepting/rejecting mail as required.
Quite a few sites have lost lots of mail through misconfigured backup MX servers. Unfortunately, the time when you find out they are misconfigured is when you go to use them, and then you find that the backup MX has changed configuration and bounced all of your mail.
Then you realise that this mail could have queued at the sender's site if there hadn't been a broken secondary MX bouncing the mail for you.
- If you bounce mail at your server, you have logs to show what's wrong.
- If your secondary MX bounces your mail, you usually have no way to determine what happened other than via reports from the original senders that your mail bounced.
Summary
In summary, if your server/Internet connection is available most (let's say >90%) of the time, you are generally better off without a secondary MX.
If your server/link is down more than this (e.g. dialup), you should not be delivering mail directly to your server.
If you still want to consider setting up a seconday MX, ensure that:
- you have fully control of the configuration of each of the email gateways for your domain
- each gateway can make decisions on whether to accept/reject mail for the users at the domain
Mail server on dynamic IP
Problems with running a mail server on SME server using a dynamic external IP from ISP
This information comes from http://bugs.contribs.org/show_bug.cgi?id=2057#c10
This is the chronological sequence of events that leads to issues with mail servers on dynamic IPs:
1) Server gets dynamic IP
2) Reboot/power fail (without updating dynamic DNS to "offline")
3) Another server/someone else is allocated your old IP while your server is down
4) The other server/person is running a mail server
5) The other server either gets your mail (which is bad) or bounces your mail (also bad)
You have no control over this issue and you will lose mail when it happens. If you have a dynamic IP, the recommended approach is to get someone with a static IP to queue your inbound mail and send it to you on a non-standard port, preferably with an authentication mechanism which queues the mail if the auth fails, just in case someone else happens to have a mail server on the same port (while highly unlikely, this is possible).
Whether this issue is really a problem to end users, depends on how much you "value" your mail. For a home user having their own mail server, it is probably not a great problem if some messages should happen to go astray, but for all other classes of users, you should really avoid running a mail server on a dynamic IP, without implementing a suitable queueing workaround as suggested. Some ISPs change the IP very infrequently eg yearly, so in those cases it is also not a significant problem. Many/most ISP's will issue a new IP every time a connection is lost & re-established, so these situations are more problematic.