^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: DEBUG: auth_pam: pam_authenticate failed: User not known to the underlying authentication module$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: DEBUG: auth_pam: pam_authenticate failed: Authentication failure$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: \(pam_unix\) authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= [[:space:]]*user=[-._[:alnum:]]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd: pam_unix\([[:alnum:]]+:[[:alnum:]]+\): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=[-_.:[:alnum:]]+  user=[-_.[:alnum:]]+$
^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ saslauthd\[[[:digit:]]+\]: do_auth[[:space:]]*: auth failure: \[user=[._[:alnum:]-]+\] \[service=smtp\] \[realm=[._[:alnum:]-]+\] \[mech=pam\] \[reason=PAM auth error\]$