/etc/logcheck/violations.ignore.d/logcheck-sendmail is in sendmail-base 8.15.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | ^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: alias database .* rebuilt
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*stat=(Refused|Deferred)
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: gethostbyaddr\(.*\) failed:
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: rejecting connections on daemon
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: DIGEST-MD5: failed .* later in exchange
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=450 4\.7\.1 <[^>]+>... Relaying temporarily denied. Cannot resolve PTR record for [0-9\.]+$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=451 4\.1\.8 Domain of sender address [^ ]+ does not resolve$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=550 5\.7\.1 (<[^>]+>... )?Access denied$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=550 5\.7\.1 <[^>]+>... Relaying denied. Proper authentication required.$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=550 5\.7\.1 <[^>]+>... Relaying denied. IP name lookup failed \[[0-9\.]+\]$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=550 5\.7\.1 <[^>]+>... Relaying denied. IP name (lookup )?possibly forged \[[0-9\.]+\]$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: .*reject=553 5\.1\.8 <[^>]+>... Relaying temporarily denied. Cannot resolve PTR record for [0-9\.]+$
^(\w{3} [ :0-9]{11}|([0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]{6})?\+[0-9]{2}:[0-9]{2})) [._[:alnum:]-]+ (sendmail|sm-(mta|msp|que))\[[0-9]+\]: [[:alnum:]]+: Milter (add|change|delete|message).*:.*$
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