sendmail의 이상한 로그

안녕하세요. 다름이 아니오라 sendmail이 몇일전부터 이상한 메일을 다른 사용자 id를

사용해서 딴 사람들한테 메일을 보내는데 왜 이런지 궁금합니다.

/var/log의 maillog를 보면 아래와 같이 나옵니다.

로그를 보면 yskang이란 아이디를 갖고 있는 사람이 다른 사람들한테 메일을

보내는거 같은데, yskang이란 분은 이런 메일을 보낸적이 없다고 하거든요.

또한 mailer local died with signal 11 이란게 있는데 이건 어떤 의미인지도 궁금합니다.

Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: to=<tschoi@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+16:28:06, xdelay=00:00:01, mailer=local, pri=6003335, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: to=<wbcho@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+16:28:06, xdelay=00:00:00, mailer=local, pri=6003335, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: to=<bethlee@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+16:28:06, xdelay=00:00:00, mailer=local, pri=6003335, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h8444Tg01499: to=<kschoi@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+16:28:06, xdelay=00:00:00, mailer=local, pri=6003335, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: to=<tschoi@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+20:32:40, xdelay=00:00:00, mailer=local, pri=6333107, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: to=<wbcho@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+20:32:40, xdelay=00:00:00, mailer=local, pri=6333107, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: to=<kschoi@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+20:32:40, xdelay=00:00:00, mailer=local, pri=6333107, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: SYSERR(root): mailer local died with signal 11
Sep  7 05:32:35 www sendmail[23441]: h83Nxtg15804: to=<bethlee@test.com>, ctladdr=<yskang@test.com> (10000/10000), delay=2+20:32:40, xdelay=00:00:00, mailer=local, pri=6333107, dsn=4.0.0, stat=Deferred
Sep  7 05:32:35 www sendmail[23441]: h839nrg31210: SYSERR(root): mailer local died with signal 11