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# Fail2Ban filter for selected Postfix SMTP rejections##[INCLUDES]# Read common prefixes. If any customizations available -- read them from# common.localbefore = common.conf[Definition]_daemon = postfix(-\w+)?/(?:submission/|smtps/)?smtp[ds]failregex = ^%(__prefix_line)sNOQUEUE: reject: RCPT from \S+\[<HOST>\]: 554 5\.7\.1 .*$^%(__prefix_line)sNOQUEUE: reject: RCPT from \S+\[<HOST>\]: 450 4\.7\.1 Client host rejected: cannot find your hostname, (\[\S*\]); from=<\S*> to=<\S+> proto=ESMTP helo=<\S*>$^%(__prefix_line)sNOQUEUE: reject: RCPT from \S+\[<HOST>\]: 450 4\.7\.1 : Helo command rejected: Host not found; from=<> to=<> proto=ESMTP helo= *$^%(__prefix_line)sNOQUEUE: reject: EHLO from \S+\[<HOST>\]: 504 5\.5\.2 <\S+>: Helo command rejected: need fully-qualified hostname;^%(__prefix_line)sNOQUEUE: reject: VRFY from \S+\[<HOST>\]: 550 5\.1\.1 .*$^%(__prefix_line)sNOQUEUE: reject: RCPT from \S+\[<HOST>\]: 450 4\.1\.8 <\S*>: Sender address rejected: Domain not found; from=<\S*> to=<\S+> proto=ESMTP helo=<\S*>$^%(__prefix_line)simproper command pipelining after \S+ from [^[]*\[<HOST>\]:?$ignoreregex =[Init]journalmatch = _SYSTEMD_UNIT=postfix.service# Author: Cyril Jaquier