Feb 27 15:49:07 batman sm-mta[88390]: ruleset=check_relay, arg1=189-30-205-74.paebv701.dsl.brasiltelecom.net.br, arg2=189.30.205.74, relay=189-30-205-74.paebv701.dsl.brasiltelecom.net.br [189.30.205.74], reject=421 4.3.2 Too many open connections.
Feb 27 15:44:18 batman sm-mta[87838]: s1REiHdq087838: ruleset=check_rcpt, arg1=<gert-jan@t-online.ch>, relay=[41.204.78.137], reject=550 5.7.1 <gert-jan@t-online.ch>... Relaying denied. IP name lookup failed [41.204.78.137]
Feb 27 15:49:02 batman sm-mta[88377]: s1REn1un088377: ruleset=check_rcpt, arg1=<non-existing-user@example.com>, relay=189-30-205-74.paebv701.dsl.brasiltelecom.net.br [189.30.205.74], reject=550 5.1.1 <non-existing-user@example.com>... User unknown
Feb 27 22:44:42 batman sm-mta[30972]: s1RLieRP030972: ruleset=check_rcpt, arg1=<existing-user@example.com>, relay=[123.69.106.50], reject=553 5.1.8 <existing-user@example.com>... Domain of sender address lf@ibuv.net does not exist