I have a email system I am working on right now. Postfix/Dovecot with Amavis/Spamassassin for filtering. Currently I use a sieve rule to filter messages that Amavis marks as spam using header modification.
Amavis scans all outbound messages as well, but there is no filtering taking place. So my question is this: How can I filter outbound email using the header modifications?
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