로그는 아래와 같이 나오네요...
 Dec  2 10:58:43 www sendmail[29040]: fARCSF720557: to=<r25179 at postaweb.com>, delay=4+13:30:28, xdelay=00:00:48, m
ailer=esmtp, pri=9302379, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.
: host name lookup failure
Dec  2 10:58:43 www sendmail[29040]: fARCXq720744: to=<f14426 at postaweb.com>, delay=4+13:24:51, xdelay=00:00:00, m
ailer=esmtp, pri=9302407, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.
: host name lookup failure
Dec  2 10:58:43 www sendmail[29040]: fARBNv719176: to=<b20402 at postaweb.com>, delay=4+14:34:46, xdelay=00:00:00, m
ailer=esmtp, pri=9392341, relay=r-mail3.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail3.hanmail.net.
: host name lookup failure
Dec  2 11:00:46 www sendmail[30136]: fAT9pQ705309: to=<b20402 at postaweb.com>, delay=2+16:09:20, xdelay=00:01:36, m
ailer=esmtp, pri=5522401, relay=r-mail21.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail21.hanmail.ne
t.: host name lookup failure
Dec  2 11:01:34 www sendmail[32282]: fB1E0I912691: to=<l16605 at postaweb.com>, delay=12:01:16, xdelay=00:04:00, mai
ler=esmtp, pri=1112372, relay=r-mail13.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail13.hanmail.net.
: host name lookup failure
Dec  2 11:01:46 www sendmail[29040]: fARAjR718239: to=<g19315 at postaweb.com>, delay=4+15:16:19, xdelay=00:00:00, m
ailer=esmtp, pri=9482323, relay=r-mail4.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail4.hanmail.net.
: host name lookup failure
Dec  2 11:01:53 www sendmail[30136]: fAT7J3702174: to=<k3139 at olemail.com>, delay=2+18:42:50, xdelay=00:00:00, mai
ler=esmtp, pri=5702381, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.:
host name lookup failure
Dec  2 11:03:23 www sendmail[32282]: fB1CFB911001: to=<p20870 at olemail.com>, delay=13:48:12, xdelay=00:00:48, mail
er=esmtp, pri=1202335, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.: h
ost name lookup failure
Dec  2 11:04:18 www sendmail[31268]: fAUDtD705655: to=<q28381 at olemail.com>, delay=1+12:09:05, xdelay=00:00:00, ma
iler=esmtp, pri=3182399, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.:
 host name lookup failure
Dec  2 11:05:56 www sendmail[32282]: fB1B7bI09727: to=<h3726 at postaweb.com>, delay=14:22:10, xdelay=00:00:00, mail
er=esmtp, pri=1291625, relay=r-mail2.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail2.hanmail.net.: h
ost name lookup failure
Dec  2 11:09:53 www sendmail[32282]: fB1AvM909518: to=<g12087 at olemail.com>, delay=15:12:31, xdelay=00:00:00, mail
er=esmtp, pri=1382325, relay=r-mail1.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail1.hanmail.net.: h
ost name lookup failure
Dec  2 11:10:52 www sendmail[30136]: fAT42B730501: to=<m25545 at postaweb.com>, delay=2+22:08:41, xdelay=00:01:36, m
ailer=esmtp, pri=5972401, relay=r-mail3.hanmail.net., dsn=4.0.0, stat=Deferred: Name server: r-mail3.hanmail.net.
 그럼 답변 주시길... 부탁 드립니다.