How to Stop Spam With Postfix Linux Email Server

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How to stop spam / UCE with the Postfix mail transfer agent (MTA). Actual spam email is analyzed using mail logs and various SMTP restrictions are explored, as well as looking into how to setup client restriction maps to reject or defer. Lastly, different Postfix debug approaches are discussed.

As demonstrated with Postfix v3.1.12 on Debian 9.

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Music:
Special THANK YOU to my friends at Epidemic Sound!

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

BenBilesBB-box
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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?

JivanPal