이 로그가 무슨 의미죠??

LogWatch 프로그램으로 메일 로그를 보고 있는데요.
며칠 전부터 이메일쪽에 아래와 같이 로그게 계속 보이네요..
스팸메일 서버로 이용할려구 시도 하는것 같기도 하구
메일서버 취약점을 공격하는것 같기두 하는데
정확한 의미는 모르겠어요...
어떤 의미이구, 해결은 어케 해야 하는지 도와주세요...

그리구 맨 아래는 SSHD 로그 인데요..이건..아마두 취약점 스켄을 한걸까요?

IP를 추적해보니 여러 나라를 거쳐왔더라구요...
**Unmatched Entries**

g6NFMmIa028468: ruleset=check_subject, arg1=377377377377377377377377 377377377377377377377377 377377377377377377377377377377 377377377377377377377377377377[377377377377], relay=[211.244.131.75], reject=553 5.0.0 ADV mail not accepted.- If you have questions,please email admin@ns.xxxx.xx.xx.- REGEX_ADKSUB
g6NFfVIa028884: lost input channel from [211.113.172.158] to MTA after rcpt
g6NG0VIa029281: lost input channel from [211.186.235.103] to MTA after rcpt
g6NGNYIa029647: lost input channel from [211.110.206.189] to MTA after rcpt
g6NGZAIa029921: ruleset=check_subject, arg1=[377377377377]377377377377377377377377 377377377377377377377377377377377377377377 377377377377 377377377377377377(377377377377377377377377377377377377377377377377377377), relay=[61.73.152.235], reject=553 5.0.0 ADV mail not accepted.- If you have questions,please email admin@ns.xxxx.xx.xx.- REGEX_ADKSUB
g6NGmuIa030120: lost input channel from [211.244.112.120] to MTA after rcpt
g6NHHRIa030713: [211.216.7.80] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
g6NHIgIa030715: lost input channel from [211.209.74.72] to MTA after rcpt
g6NHKYIa030810: lost input channel from [211.207.4.180] to MTA after rcpt
g6NHcaIa031120: jayoo@admin@ns.xxxx.xx.xx.... User unknown
g6NHnNIa031316: lost input channel from [61.104.145.100] to MTA after rcpt
g6NI6gIa031696: lost input channel from [211.189.26.136] to MTA after rcpt
g6NI76Ia031697: lost input channel from [218.50.22.9] to MTA after rcpt

**Unmatched Entries**
scanned from 200.5.125.35 with SSH-1.0-SSH_Version_Mapper.  Don't panic.