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fail2ban/config/filter.d/postfix-sasl.conf

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# Fail2Ban filter for postfix authentication failures
#
[INCLUDES]
before = common.conf
[Definition]
_daemon = postfix/(submission/)?smtp(d|s)
failregex = ^%(__prefix_line)swarning: [-._\w]+\[<HOST>\]: SASL (?:LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed(: [ A-Za-z0-9+/]*={0,2})?\s*$
ignoreregex =
[Init]
journalmatch = _SYSTEMD_UNIT=postfix.service
# Author: Yaroslav Halchenko
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