메일을 보내면 아래와 같은 메시지를 돌려보내면서
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꼭좀 답변을....
The original message was received at Tue, 19 Dec 2000 19:38:25 +0900
from IDENT:root@[203.227.xxx.29]
----- The following addresses had permanent fatal errors -----
<eeeeee at hanmail.net>
(reason: 553 5.1.0 eeeeee: sender blocked)
----- Transcript of session follows -----
... while talking to www12.hanmail.net:
>>> DATA
<<< 553 5.1.0 eeeeee: sender blocked
554 5.0.0 <eeeeee at hanmail.net>... Service unavailable