Hi, I am using a 2.3 postfix with spamassassin under freeBSD.
Actually I am trying to stop a massive backscatting attack to my smtp server. I followed the backscatting procedure on postfix website but it doesn't work. Message-ID or EHLO fields for instance are too similar to my 'normal' emails. So the only solution is to test 'From:' AND 'To:' fields in the header_checks file. For instance: From: +...@mydomain\.tld To: +...@mydomain\.tld Normally, I do not receive any email from my own domain. So I can delete these emails without ulterior motive. I founded an interesting regex which can test two patterns (pattern 1 AND pattern 2) but it doesn't work in the header_checks file. Do u have any solution I could test on my config? I guess can find the solution with spamassassin but I'd like to find a solution with postfix in preference. best regards bruno grandjean
