Recipient unknown 如何解决！！！急
Thu 2004-09-16 10:48:31: Accepting SMTP connection from <br>Thu 2004-09-16 10:48:31: Looking up PTR record for 216.136.175.29 (29.175.136.216.IN-ADDR.ARPA)<br>
Thu 2004-09-16 10:48:31: D=29.175.136.216.IN-ADDR.ARPA TTL=(20) PTR=<br>
Thu 2004-09-16 10:48:31: Gathering A-records for PTR hosts<br>
Thu 2004-09-16 10:48:32: D=web13903.mail.yahoo.com TTL=(30) A=<br>
Thu 2004-09-16 10:48:32: --> 220 mail.sninfo.gov.cn ESMTP MDaemon 6.8.5; Thu, 16 Sep 2004 10:48:32 +0800<br>
Thu 2004-09-16 10:48:32: <-- HELO web13903.mail.yahoo.com<br>
Thu 2004-09-16 10:48:32: --> 250 mail.sninfo.gov.cn Hello web13903.mail.yahoo.com, pleased to meet you<br>
Thu 2004-09-16 10:48:32: <-- MAIL FROM:<shenvo@yahoo.com><br>
Thu 2004-09-16 10:48:32: --> 250 <shenvo@yahoo.com>, Sender ok<br>
Thu 2004-09-16 10:48:32: <-- RCPT TO:<liuf@sninfo.gov.cn><br>
Thu 2004-09-16 10:48:32: Sender attempted to deliver message to unknown address<br>
Thu 2004-09-16 10:48:32: --> 550 <liuf@sninfo.gov.cn>, Recipient unknown<br>
Thu 2004-09-16 10:48:33: <-- QUIT<br>
Thu 2004-09-16 10:48:33: --> 221 See ya in cyberspace<br>
Thu 2004-09-16 10:48:33: SMTP session successful, 96 bytes transferred.<br>
Thu 2004-09-16 10:48:33: ----------<br>
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最近老是这问题，从哪发来的都提示Recipient unknown，大家帮我看看是怎么了？
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