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Some of my users have aliases in /etc/postfix/virtual that forward to other providers (mostly gmail). I believe that the fact that all mail is forwarded (even SPAM) is causing reputation issues for my IP. How can I block forwarding of mail that SpamAssasin says are SPAM, while still delivering SPAM to local (non-forward) users?

singpolyma
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    Maybe check https://aikar.co/2014/09/05/filtering-spam-forwarding-email-postfixspamassassin/ – klokop Nov 04 '16 at 09:36

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