메일로그내용입니다. 분석좀 해주세요!!

아래메일이 날마다 옵니다.

아래메일이 어떤내용인지 분석좀 해주세요.

또 이런메일을 막을수 있는 방법은 없을까요?

The original message was received at Wed, 23 Feb 2005 09:08:24 +0900
from localhost
with id j1N08OiE000710

   ----- The following addresses had permanent fatal errors -----
<Eciqrbch72@hotmail.com>
    (reason: 550 Requested action not taken: mailbox unavailable)

   ----- Transcript of session follows -----
... while talking to mx2.hotmail.com.:
>>> DATA
<<< 550 Requested action not taken: mailbox unavailable
550 5.1.1 <Eciqrbch72@hotmail.com>... User unknown
<<< 503 Need Rcpt command.