How to Stop Spam With Postfix Linux Email Server

[@grokshop]

Assciated blog post: grokshop.tv/stop-spam-with-postfix-email-server/

[@BenBilesBB-box]

thanks !! very useful for my postfix server sending around 50 mails a day at the most !

[@alex_94-r2g]

Thank you for the tutorial

[@sunil951]

Thank you for sharing and helping us.

[@JivanPal]

All of these measures outright deny emails, correct? Emails are never passed through but flagged as spam? If so, then tools like SpamAssassin should still be used to filter potential spam emails form otherwise "legitimate" senders into the user's spam/junk mailbox, right? After all, we don't want to completely block legitimate emails sent by servers which don't follow some best practices that aren't required by the RFCs, do we?

[@dorkthps9414]

No, emails are permitted unless one of the mentioned rules applies. Otherwise, the email goes through

[@JivanPal]

@@dorkthps9414 Right, but the point I'm making is that some legitimate domains that abide by the RFCs but don't follow certain best practices like FQDN rather than IP in the HELO/EHLO will be rejected by the mail server rather than landing in the user's spam. Using a tool like SpamAssassin in conjunction with more relaxed Postfix restrictions will allow the user to actually receive these wanted emails. Of course, in an ideal world, all legitimate mail servers would follow best practices, but that's sadly not the world we live in.