Christian thank you for the quick response. The edge servers are running sendmail and my zimbra install runs postfix. If I am understanding what you are saying correctly the header_checks statement runs a discard filter. I can not discard the mail I have to deliver it locally only and ensure that it does not get forwarded to gmail (or any other) because the user has a forwarder set to gmail. If I misunderstood I apologize.
Regards, Pablo Garaitonandia Penn State University ITS, Administrative Information Services pa...@psu.edu ----- Original Message ----- From: "Christian Rößner" <c...@roessner-network-solutions.com> To: "Pablo E Garaitonandia" <pe...@psu.edu> Cc: postfix-users@postfix.org Sent: Friday, May 20, 2016 3:02:39 PM Subject: Re: Stopping Spam from Forwarding > Am 20.05.2016 um 20:52 schrieb Pablo E Garaitonandia <pe...@psu.edu>: > > Hello all, > I am a rookie to postfix, I apologize in advance, and I have been > tasked with not allowing SPAM to be forwarded. I basically receive messages > from an edge mail server that adds a header to a messages stating whether it > has been flagged for spam or not and another that gives the message a > numerical spam rating spam rating. I am also not running spam assassin or > clamav on my system because these edge servers already mitigate those issues. > My job is to ensure that if a person has a forwarder set to another domain to > only deliver the SPAM locally and not forward it. This is on a Zimbra 8.6.0 > install. If someone could point me in the right direction I would greatly > appreciate it. I have been looking on line and what I have been finding is > mostly about rejecting SPAM. I have also been looking at postfix after-queue > content filtering on the postfix docs. But I need some good examples and I am > not really quite sure what commands I would use to deliver only locally. Any > guidance would be appreciated. Not sure, if I understood correctly. You receive mail on a Postfix server that is already been spam checked and that carries headers that you can parse, right? If so, I would add a header_checks_maps parameter in PCRE format and send it through FILTER discard: For example in main.cf: ------------------------------------------------- header_checks = pcre:/etc/postfix/header_checks ------------------------------------------------- header_checks: ------------------------------------------------- /^My-SPAM-Flag:.+Yes$/i FILTER discard: ------------------------------------------------- You might need to place the header_checks inside master.cf. It depends on your setup. Maybe this works for you Christian — Christian Rößner B.Sc. Erlenwiese 14, 36304 Alsfeld T: +49 6631 78823400, F: +49 6631 78823409, M: +49 171 9905345 USt-IdNr.: DE225643613, http://www.roessner-network-solutions.com
