fail2ban/config/filter.d/exim.conf

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# Fail2Ban filter for exim
#
# This includes the rejection messages of exim. For spam and filter
# related bans use the exim-spam.conf
#
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# exim-common.local
before = exim-common.conf
[Definition]
prefregex = ^%(__prefix_line)s<F-CONTENT>.+</F-CONTENT>$
failregex = ^%(host_info)s sender verify fail for <\S+>: (?:Unknown user|Unrouteable address|all relevant MX records point to non-existent hosts)\s*$
^\s?\w+ authenticator failed for%(host_info)s: 535 Incorrect authentication data(?: \(set_id=.*\)|: \d+ Time\(s\))?\s*$
^%(host_info)s rejected RCPT [^@]+@\S+: (?:relay not permitted|Sender verify failed|Unknown user|Unrouteable address)\s*$
^\s?SMTP protocol synchronization error \([^)]*\): rejected (?:connection from|"\S+")%(host_info)s (?:next )?input=".*"\s*$
^\s?SMTP call from%(host_info)s dropped: too many (?:(?:nonmail|unrecognized) commands|syntax or protocol errors)
^\s?SMTP protocol error in "[^"]+(?:"+[^"]*(?="))*?"%(host_info)s [A-Z]+ (?:command used when not advertised|authentication mechanism not supported)\s*$
^\s?no MAIL in SMTP connection from%(host_info)s
^\s?(?:[\w\-]+ )?SMTP connection from%(host_info)s closed by DROP in ACL\s*$
<mdre-<mode>>
mdre-aggressive = ^\s?no host name found for IP address <ADDR>$
^\s?no IP address found for host \S+ \(during SMTP connection from%(host_info)s\)$
mdre-normal =
# Parameter `mode` - `normal` or `aggressive`.
# Aggressive mode can be used to match flood and ddos-similar log-entries like:
# 'no host found for IP', 'no IP found for host'.
# Note this is not an authentication failures, so it may produce lots of false
# positives on misconfigured MTAs.
# Ex.:
# filter = exim[mode=aggressive]
mode = normal
ignoreregex =
# DEV Notes
# -----------
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# The %(host_info) definition contains a <ADDR> match. No space before. See exim-common.conf
#
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# SMTP protocol synchronization error \([^)]*\) <- This needs to be non-greedy
# to void capture beyond ")" to avoid a DoS Injection vulnerability as input= is
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# user injectable data.