적수네 동네 - 질문과 답변 [ 게시물 수정 ]

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			이름
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NOQUEUE: [61.80.99.153] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
g3AMufv28844: g3AMuuu28850: DSN: Service unavailable
NOQUEUE: chris.newmill.com [67.104.51.129] (may be forged) did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
NOQUEUE: [211.199.51.147] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
g3B1kVF32120: g3B1kVE32122: DSN: Service unavailable
g3B2EYL00672: g3B2EZK00674: DSN: Service unavailable
g3B5Lue07567: collect: premature EOM: Error 0
g3B5Lue07567: collect: unexpected close on connection from s211-49-1-118.thrunet.ne.kr, sender=<99w0n@hanmail.net>: Error 0
g3B796e12140: ruleset=check_mail, arg1=<this@no.return>, relay=[218.232.117.10], reject=553 5.1.8 <this@no.return>... Domain of sender address this@no.return does not exist
NOQUEUE: [211.49.212.239] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
g3B8gMT15524: g3B8gYS15526: DSN: Service unavailable
g3B8gX915534: g3B8gh815536: DSN: Service unavailable
g3B8kBg15705: g3B8kCf15709: DSN: Service unavailable
g3B8kDU15716: g3B8kET15718: DSN: Service unavailable
g3BEiqe28931: ruleset=check_rcpt, arg1=<relay_check@root-servers.net>, relay=dclient217-162-176-83.hispeed.ch [217.162.176.83], reject=550 5.7.1 <relay_check@root-servers.net>... Relaying denied
 아래에서 처럼 하루에도 몇번씩 DSN : Service unavailable
이라는 메시지가 로그에 쌓이는데요. 
왜 그런지 아시는분은 하수에게 한 수 가르침을 부탁드립니다.
 아무래도 메일하고 DNS 문제인거 같은데 보시면 아시겠지만
DSN 이 아니고 DNS 라고 나오네요..흑..
 제발 좀 갈켜주세요. 여기저기 게시판을 뒤져봐도 해답을 못찾겠습니다.