这是什么原因？

lrain

本人用MDaemon Pro 7.0L搭建的邮件服务器，外面发进来的邮件有的可以收到，有的不能收到，收不到的邮件Log如下，帮忙看看是什么原因：<br>
<br>
Tue 2003-12-16 10:33:39: Session 232; child 1; thread 380<br>
Tue 2003-12-16 10:23:39: Accepting SMTP connection from [202.108.255.195 : 56633]<br>
Tue 2003-12-16 10:23:39: Looking up PTR record for 202.108.255.195 (195.255.108.202.IN-ADDR.ARPA)<br>
Tue 2003-12-16 10:23:39: Name server reports domain name unknown.<br>
Tue 2003-12-16 10:23:39: --> 220 xxx.net ESMTP MDaemon 7.0.0l; Tue, 16 Dec 2003 10:23:39 +0800<br>
Tue 2003-12-16 10:23:40: <-- EHLO 163.net<br>
Tue 2003-12-16 10:23:40: Performing lookup on 163.net (looking for 202.108.255.195)<br>
Tue 2003-12-16 10:23:40: D=163.net TTL=(1) A=[202.108.255.203]<br>
Tue 2003-12-16 10:23:40: --> 250-xxx.net Hello 163.net (may be forged), pleased to meet you<br>
Tue 2003-12-16 10:23:40: --> 250-ETRN<br>
Tue 2003-12-16 10:23:40: --> 250-AUTH=LOGIN<br>
Tue 2003-12-16 10:23:40: --> 250-AUTH LOGIN CRAM-MD5<br>
Tue 2003-12-16 10:23:40: --> 250-8BITMIME<br>
Tue 2003-12-16 10:23:40: --> 250 SIZE 0<br>
Tue 2003-12-16 10:23:40: <-- MAIL FROM:<xxx@163.net> SIZE=8354<br>
Tue 2003-12-16 10:23:40: Performing lookup on 163.net (looking for 202.108.255.195)<br>
Tue 2003-12-16 10:23:40: D=163.net TTL=(1) A=[202.108.255.203]<br>
Tue 2003-12-16 10:23:40: --> 250 <xxx@163.net>, Sender ok<br>
Tue 2003-12-16 10:23:40: <-- RCPT TO:<xxx@xxx.net><br>
Tue 2003-12-16 10:23:40: --> 250 <xxx@xxx.net>, Recipient ok<br>
Tue 2003-12-16 10:23:40: <-- DATA<br>
Tue 2003-12-16 10:23:40: Creating temp file (SMTP): c:\progra~1\mdaemon\temp\md50000000044.tmp<br>
Tue 2003-12-16 10:23:40: --> 354 Enter mail, end with <CRLF>.<CRLF><br>
Tue 2003-12-16 10:33:39: Connection timed out!<br>
Tue 2003-12-16 10:33:39: SMTP session abnormally terminated (Bytes in/out: 91/336)<br>
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钉子

1.有时还是到163.NET的都不行、<br>
2.试试更改一下SMTP和POP3的会话时间。（加长些）<br>
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