求助！

shq1104

我的邮件系统突然出现问题，发出去的邮件（一些如sina,163等)都被退了回来（反馈信息如下），发到自己系统内部的邮件正常！这是为什么？<br>
The attached message had PERMANENT fatal delivery errors!<br>
<br>
After one or more unsuccessful delivery attempts the attached message has<br>
been removed from the mail queue on this server. The number and frequency<br>
of delivery attempts are determined by local configuration parameters.<br>
<br>
YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS!<br>
<br>
Failed address: shqzm@163.net<br>
<br>
--- Session Transcript ---<br>Wed 2005-10-12 17:30:48: Parsing Message <xxxxxxxxxxxxxxxxxx\pd50000015027.msg><br>Wed 2005-10-12 17:30:48: From: shq@cajy.net<br>Wed 2005-10-12 17:30:48: To: shqzm@163.net<br>Wed 2005-10-12 17:30:48: Subject: weqre<br>Wed 2005-10-12 17:30:48: Message-ID: <WorldClient-F200510121729.AA29590000@cajy.net><br>Wed 2005-10-12 17:30:48: MX-record resolution of [163.net] in progress (DNS Server: 221.228.255.1)...<br>Wed 2005-10-12 17:30:48: P=010 D=163.net TTL=(3) MX=[bjmx.163.net] {202.108.255.224}<br>Wed 2005-10-12 17:30:48: Attempting MX: P=010 D=163.net TTL=(3) MX=[bjmx.163.net] {202.108.255.224}<br>Wed 2005-10-12 17:30:48: Attempting SMTP connection to [202.108.255.224 : 25]<br>Wed 2005-10-12 17:30:48: Waiting for socket connection...<br>Wed 2005-10-12 17:30:48: Socket connection established (61.177.147.19 : 1078 -> 202.108.255.224 : 25)<br>Wed 2005-10-12 17:30:48: Waiting for protocol initiation...<br>Wed 2005-10-12 17:30:49: <-- 220 Coremail SMTP(Anti Spam) System (163net[040302])<br>Wed 2005-10-12 17:30:49: --> EHLO mail.cajy.net<br>Wed 2005-10-12 17:30:49: <-- 250-bjfee_mxt4<br>Wed 2005-10-12 17:30:49: <-- 250-PIPELINING<br>Wed 2005-10-12 17:30:49: <-- 250-ETRN<br>Wed 2005-10-12 17:30:49: <-- 250-AUTH LOGIN PLAIN<br>Wed 2005-10-12 17:30:49: <-- 250-AUTH=LOGIN PLAIN<br>Wed 2005-10-12 17:30:49: <-- 250 8BITMIME<br>Wed 2005-10-12 17:30:49: --> MAIL From:<shq@cajy.net><br>Wed 2005-10-12 17:30:52: <-- 250 Ok<br>Wed 2005-10-12 17:30:52: --> RCPT To:<shqzm@163.net><br>Wed 2005-10-12 17:31:13: <-- 550 <shqzm@163.net>: Invalid User<br>
--- End Transcript ---<br>
: Message contains [1] file attachments<br>
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请高手解答！谢谢

stdmis

shqzm@163.net: Invalid User<br>
檢查你的收件人的郵件地址是否真的存在