When you have a shared IP for multiple domains, it’s important to avoid the blacklisting of the IP for spamming.
Outgoing Spam can be controlled with Plesk 12 by enabling Outgoing Mail Limits but an important point is about mail addresses with forwarding to an external mailbox, especially when you have SRS (will be explained in a future post) activated on your server as SRS will rewrite the Return-Path to your own domain and if Spam is forwarded it’s the same thing as if you really send this Spam from your server.
You may have many mailboxes on the server and setting the spam filter could be a hard work to do it manually, here come the Plesk CLI and SQL queries to the PSA database. (more…)