From SME Server
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=====SME Dedicated DNS Blacklist=====
The first functionality is a SME dedicated DNS Blacklist which is partially based on the user contributions. With SME Optimizer you provide data about your spam rejects and in return you get access to a large DNS blacklist. This blacklist is both providing IP as well as URI based lists and comes as a configuration option to SpamAssassin. The DNS Blacklist has as of today (October 2016) around 1.4 mio. Spam, Malware and Ransomware IP addresses as well as around 350,000 URIs. These will be provided as part of the DNS Blacklist.
-contact=[Email]: Set the contact email address where alerts are sent to - default admin@<your domain>.
-VTAPI=[API Key]: This is the VirusTotal public API key used to check attachments (will remain local).
==Privacy and Security==
All IP and URL/URI checks are performed a simple DNS lookups through SpamAssassin
and the sending IP address or domain is used for this lookup just as any other DNS blacklist (Spamhaus, etc.).
When your own server, based on your configured DNS blacklists, rejects a mail the SMEOptimizer qpsmtpd plugin will capture the sending IP address and the sender domain as well as the return text from the dnsbl plugin (Usually a link provided by the DNS blacklist service for further details). These details are stored in a local MySQL database and on a hourly basis transferred via HTTPS PUT to the SMEOptimizer server. Here, based on a score system, they are added to the shared DNS Blacklist for all to benefit from.