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 (a@example.com) > My Server My Server > MX lookup example.com If MX for example.com contains 1.2.3.4, accept mail, else reject. Quote Link to comment 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. Quote Link to comment Share on other sites More sharing options...
JudgementDay Posted February 4, 2012 Author Share Posted February 4, 2012 Thanks man. Thats for mail forwarding. Quote Link to comment Share on other sites More sharing options...
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