saslauthd auth failure

messagesに以下のログが定期的に出力

saslauthd[1312]: do_auth         : auth failure: [user=adam] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1313]: do_auth         : auth failure: [user=abuse] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1315]: do_auth         : auth failure: [user=smmsp] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1311]: do_auth         : auth failure: [user=office] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1312]: do_auth         : auth failure: [user=sms] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1313]: do_auth         : auth failure: [user=rachel] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1315]: do_auth         : auth failure: [user=visitor] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1311]: do_auth         : auth failure: [user=teacher] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1314]: do_auth         : auth failure: [user=john] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1312]: do_auth         : auth failure: [user=company] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1313]: do_auth         : auth failure: [user=client] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1315]: do_auth         : auth failure: [user=postgres] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1314]: do_auth         : auth failure: [user=support] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1312]: do_auth         : auth failure: [user=adrian] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1311]: do_auth         : auth failure: [user=carrie] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1313]: do_auth         : auth failure: [user=software] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1315]: do_auth         : auth failure: [user=accouting] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1313]: do_auth         : auth failure: [user=info] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1311]: do_auth         : auth failure: [user=shop] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error] 
saslauthd[1312]: do_auth         : auth failure: [user=sys] [service=smtp] [realm=] [mech=pam] [reason=PAM auth error]

これは、SMTP不正認証アタックの際に出力されるが、
SMTP-Authのブロックが効いているため影響はない。

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