스팸메일이 발송된다고 합니다

resendmail 하면 뜨는 로그입니다.

==== Now sendmail reloaded, Good! == SH ==
13069  ??  I      0:00.01 sendmail: l2J7tYNc013069 respublikanskaya6.quantum.ru [213.170.83.122] (may be forged): DATA (sendmail)
13780  ??  I      0:00.01 sendmail: l2J7xe7h013780 [221.222.21.76]: DATA (sendmail)
13967  ??  I      0:00.01 sendmail: l2J80s0N013967 dialpool-210-214-85-224.maa.sify.net [210.214.85.224]: DATA (sendmail)
14586  ??  I      0:00.01 sendmail: l2J85S0R014586 [221.202.63.60]: DATA (sendmail)
15334  ??  I      0:00.01 sendmail: server [59.7.117.115] cmd read (sendmail)
15727  ??  I      0:00.00 sendmail: server chello089078027143.chello.pl [89.78.27.143] cmd read (sendmail)
16139  ??  I      0:00.01 sendmail: l2J8Iqix016139 110.237.79.222.broad.qz.fj.dynamic.163data.com.cn [222.79.237.110]: DATA (sendmail)
18266  ??  I      0:00.01 sendmail: server [88.229.103.157] cmd read (sendmail)
18274  ??  I      0:00.00 sendmail: server 192.21.4.122.broad.jn.sd.dynamic.163data.com.cn [122.4.21.192] (may be forged) cmd read (sendmail)
18285  ??  I      0:00.01 sendmail: l2J8ZvxI018285 [87.109.238.59]: data (sendmail)
18603  ??  I      0:00.00 sendmail: server [60.209.104.134] cmd read (sendmail)
18750  ??  I      0:00.01 sendmail: server [222.131.147.46] cmd read (sendmail)
19596  ??  S      0:00.00 sendmail: server [221.3.107.212] cmd read (sendmail)
19601  ??  S      0:00.00 sendmail: server p54a1ed97.dip.t-dialin.net [84.161.237.151] cmd read (sendmail)
19603  ??  S      0:00.00 sendmail: server [60.209.104.134] cmd read (sendmail)
19604  ??  S      0:00.00 sendmail: server [221.1.109.78] cmd read (sendmail)
19645  ??  Ss     0:00.00 sendmail: accepting connections (sendmail)
19647  ??  S      0:00.01 sendmail: ./l2J1GiBT058603 mail.mtjeju.com.: client greeting (sendmail)

------------------------------

저희 서버를 통해 스팸이 다량으로 발송되고 있다는 얘기를 듣고 요즘 로그를 민감하게 보고 있는데

워낙 초보자라 인터넷으로 뒤지고 책을 찾아도 명확한 답을 찾기가 힘드네요.

여기서 찾아보면 cmd 로 시작되는거는 신경쓰지 않아도 된다는 글을 본것 같은데 확실치 않아서요..

답변 부탁드립니다.