Changes

SPF (Sender Policy Framework) records are added to the DNS zone record for domain names. Many receiving mail servers now require sending mail servers to have properly configured SPF records for the domain(s) being sent from. Failure to have SPF records can result in mail being rejected by mail servers eg Hotmail servers will reject mail that comes from mail servers without SPF records.

SPF (Sender Policy Framework) records are added to the DNS zone record for domain names. Many receiving mail servers now require sending mail servers to have properly configured SPF records for the domain(s) being sent from. Failure to have SPF records can result in mail being rejected by mail servers eg Hotmail servers will reject mail that comes from mail servers without SPF records.

The SPF entries are added to your external DNS records. They are not configured on the sme server.

The SPF entries are added to your external DNS records which are hosted by your connectivity ISP. They are not configured on the sme server.

See [http://www.open-spf.org/ here].

See [http://www.open-spf.org/ here].

http://forums.contribs.org/index.php/topic,42373.0.html

http://forums.contribs.org/index.php/topic,42373.0.html

=====Dynamic DNS Services=====

=====Dynamic DNS Services=====  

If your IP address is assigned dynamically, you may find it helpful to use a dynamic DNS service. A dynamic DNS service provides you with an automated way to notify them whenever your IP address changes so that they can immediately publish new DNS records for your domain. Without dynamic DNS, you would have to contact your ISP to have them change your DNS records, and your web site and other services would be unavailable for several days until the change was processed. You can easily enable the usage of a dynamic DNS service by selecting it on your server console.

If your IP address is assigned dynamically, you may find it helpful to use a dynamic DNS service. A dynamic DNS service provides you with an automated way to notify them whenever your IP address changes so that they can immediately publish new DNS records for your domain. Without dynamic DNS, you would have to contact your ISP to have them change your DNS records, and your web site and other services would be unavailable for several days until the change was processed. You can easily enable the usage of a dynamic DNS service by selecting it on your server console.

A dynamic DNS service can be a great solution when used with a dedicated connection. With a typical dialup connection, your IP address changes much more frequently (possibly every time your server connects) and, because the server only connects intermittently, there is a delay in informing the dynamic DNS service of the change. This means that the risk of misdirected information is much greater with a dialup connection. For this reason, we recommend and support the use of dynamic DNS services only for dedicated connections.

{{warning box|Pre-configured Dynamic DNS Service is no longer integrated into SME Server core functionality due to its rapidly changing providers. If you need this service, please refer to the "smeserver-dyndns" contrib.}}

Contribs.org has tested four dynamic DNS services, of which two are free services and two are commercial services: yi.org (free), dyndns.com (commercial), tzo.com (commercial) and dyndns.org (free). For simplicity, we have preprogrammed the server to work with these services (including pre-installing their client software). If you have arranged dynamic IP address assignment from your ISP and you wish to use one of these services, all you need to do is visit the appropriate web site to sign up for service, and enable that particular function in the server console. In pre-configuring the server for this particular service, we in no way interfere with nor prevent you from using another dynamic DNS service if you wish. To do so, however, would require some customized configuration on your part.

<!--Contribs.org has tested four dynamic DNS services, of which two are free services and two are commercial services: yi.org (free), dyndns.com (commercial), tzo.com (commercial) and dyndns.org (free). For simplicity, we have preprogrammed the server to work with these services (including pre-installing their client software). If you have arranged dynamic IP address assignment from your ISP and you wish to use one of these services, all you need to do is visit the appropriate web site to sign up for service, and enable that particular function in the server console. In pre-configuring the server for this particular service, we in no way interfere with nor prevent you from using another dynamic DNS service if you wish. To do so, however, would require some customized configuration on your part.

Contribs.org has tested the functionality of these services with our software. However, we accept no liability for any breach of service on their part. A failure on the part of your dynamic DNS service can result in your network becoming temporarily unreachable from the Internet. During these times, your e-mail may be undeliverable.

Contribs.org has tested the functionality of these services with our software. However, we accept no liability for any breach of service on their part. A failure on the part of your dynamic DNS service can result in your network becoming temporarily unreachable from the Internet. During these times, your e-mail may be undeliverable.-->

If your IP address is assigned dynamically and you intend to receive all your e-mail directly (rather than having it stored at an ISP and retrieving it via POP or IMAP), but you decide not to use a dynamic DNS service, you should implement multidrop e-mail as your e-mail solution as this will ensure that no e-mail is misdirected to another IP address (See Some important notes on Service list D (multidrop mail) in|[[SME_Server:Documentation:Administration_Manual:Chapter3#Service_List_D|Chapter 3]].)

If your IP address is assigned dynamically and you intend to receive all your e-mail directly (rather than having it stored at an ISP and retrieving it via POP or IMAP), but you decide not to use a dynamic DNS service, you should implement multidrop e-mail as your e-mail solution as this will ensure that no e-mail is misdirected to another IP address (See Some important notes on Service list D (multidrop mail) in|[[SME_Server:Documentation:Administration_Manual:Chapter3#Service_List_D | Chapter 3]].)

{{Note box|Dynamic DNS services are not perfect. They merely point hostnames to IP addresses. If your system receives an IP address via DHCP or PPPoE, it will automatically update the dynamic DNS service each time it comes online. However, when your server disconnects from the Internet, with most dynamic DNS services your server does not indicate that it is offline in any way to the dynamic DNS service. If your system is offline for a period of time, it is possible that someone else will be assigned your IP address by your ISP. If this occurs, with most dynamic DNS services this other system will now start receiving your e-mail and web page requests until your server comes back online and updates the service with your new IP address. There is not much you can do about this, but you should be aware of this fact if there is any chance your system will be offline for a long period of time.}}

{{Note box|Dynamic DNS services are not perfect. They merely point hostnames to IP addresses. If your system receives an IP address via DHCP or PPPoE, it will automatically update the dynamic DNS service each time it comes online. However, when your server disconnects from the Internet, with most dynamic DNS services your server does not indicate that it is offline in any way to the dynamic DNS service. If your system is offline for a period of time, it is possible that someone else will be assigned your IP address by your ISP. If this occurs, with most dynamic DNS services this other system will now start receiving your e-mail and web page requests until your server comes back online and updates the service with your new IP address. There is not much you can do about this, but you should be aware of this fact if there is any chance your system will be offline for a long period of time.}}

=====DNS Service Providers=====

=====DNS Service Providers=====

Here is a brief list of vendors who provide DNS service hosting.  The inclusion of a vendor here does not constitute endorsement by the SME developers.

Here is a brief list of vendors who provide DNS service hosting.  The inclusion of a vendor here does not constitute endorsement by the SME developers.

* Dynamic DNS client included in SME Server:

*Dyndns.com   http://www.dyndns.com      $$$ (for 'Custom DNS' services)

*DuckDNS      https://www.duckdns.org/    $free

** dyndns.com http://www.dyndns.com      $$$ (for 'Custom DNS' services)

*Zoneedit    http://www.zoneedit.com    $free

 

*FreeDNS      http://freedns.afraid.org  $free

* Other providers (dynamic DNS client not included in SME Server):

*EasyDNS      http://www.easydns.com      $19.95USD per year

** Zoneedit    http://www.zoneedit.com    $free

** FreeDNS      http://freedns.afraid.org  $free

** EasyDNS      http://www.easydns.com      $19.95USD per year

====Appendix C. Proxy Servers====

====Appendix C. Proxy Servers====

If you are having difficulty configuring another vendor's hardware or software, we recommend you refer to the manual or contact the vendor for that product.

If you are having difficulty configuring another vendor's hardware or software, we recommend you refer to the manual or contact the vendor for that product.

The SME Server is open source software, Contribs.org encourages users to freely share copies of our software.

The SME Server is open source software, Koozali.org encourages users to freely share copies of our software.

Developers may wish to note that additional documentation, including HOWTO documents and a FAQ, can be found on our development web site - http://wiki.contribs.org/. There are also links there to other web sites relating to the server.

Developers may wish to note that additional documentation, including HOWTO documents and a FAQ, can be found on our development web site - http://wiki.koozali.org/. There are also links there to other web sites relating to the server.