> Lately I've been getting email sent from one persistent spammer that's > somehow getting through my smtpd_recipient_restrictions filters. Here are > the message headers: > > Return-Path: <MAILER-DAEMON> [...] > From:=?UTF-8?B?RGVybWFDb3JyZWN0?=<i...@....xyz> [...] > smtpd_recipient_restrictions = > check_sender_access hash:/etc/postfix/blacklist_hash,
http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions smtpd_sender_restrictions like check_sender_access check the envelope_sender (MAIL FROM smtp command / Return Path) which is not necessarily the same as the From: header. In your example the null sender ("", <>, MAILER-DAEMON) is searched, not i...@....xyz. Best regards Gerald
