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fail2ban/config/filter.d/courier-smtp.conf

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# Fail2Ban filter to block relay attempts though a Courier smtp server
#
#
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf
[Definition]
_daemon = courieresmtpd
failregex = ^%(__prefix_line)serror,relay=<HOST>,.*: 550 User unknown\.$
ignoreregex =
# Author: Cyril Jaquier
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