etc/logcheck/ignore.d.server/saslauthd

   1 ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ saslauthd+\[[0-9]+\]: Domain/Realm not available\.$
   2 ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ saslauthd+\[[0-9]+\]: DIGEST-MD5 client step [0-9]+$
   3 ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: \(pam_unix\) check pass; user unknown$
   4 ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: pam_unix\([[:alnum:]]+:[[:alnum:]]+\): check pass; user unknown$
   5 ^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: do_request[[:space:]]*: NULL password received$