JudgementDay Posted February 4, 2012 Share Posted February 4, 2012 I have a stock install of Postfix from my Ubuntu repository. When I get spam coming consistently from a certain ISP, I block its IP range. I would rather not do this, but technical people under WHOIS don't take action against my complaints. I am wondering if there is a way to configure Postfix to do a MX lookup on the sender during the MTA transaction, to match the sending SMTP's server IP address against the one MX record for the mail thats coming from? Sender 1.2.3.4 ([email protected]) > My Server My Server > MX lookup example.com If MX for example.com contains 1.2.3.4, accept mail, else reject. Link to comment https://forums.phpfreaks.com/topic/256378-can-postfix-rejecting-sender-if-no-matching-mx-record/ Share on other sites More sharing options...
kicken Posted February 4, 2012 Share Posted February 4, 2012 Maybe this configuration would do it: smtpd_sender_restrictions reject_unknown_sender_domain Not sure, far from any kind of a postfix expert. That is just the closest thing I could find when I searched the man page. Link to comment https://forums.phpfreaks.com/topic/256378-can-postfix-rejecting-sender-if-no-matching-mx-record/#findComment-1314462 Share on other sites More sharing options...
JudgementDay Posted February 4, 2012 Author Share Posted February 4, 2012 Thanks man. Thats for mail forwarding. Link to comment https://forums.phpfreaks.com/topic/256378-can-postfix-rejecting-sender-if-no-matching-mx-record/#findComment-1314590 Share on other sites More sharing options...
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