是网络问题, 网络中有一个上网控制的硬件,给邮件服务器设置一下策略就可以了,谢谢。

你路由器都映射那些端口了?

日志为:
[root@mail postfix]# tail /var/log/maillog
Jul  6 14:25:13 mail postfix/smtp[3664]: 637401B000FB: lost connection with 163mx04.mxmail.netease.com[220.181.12.85] while performing the EHLO handshake
Jul  6 14:25:47 mail postfix/smtp[3663]: 17D3A1B000F8: lost connection with 163mx04.mxmail.netease.com[220.181.12.78] while performing the EHLO handshake
Jul  6 14:25:53 mail postfix/smtp[3664]: 637401B000FB: lost connection with 163mx03.mxmail.netease.com[220.181.12.69] while performing the EHLO handshake
Jul  6 14:26:31 mail postfix/smtp[3663]: 17D3A1B000F8: lost connection with 163mx04.mxmail.netease.com[220.181.12.85] while performing the EHLO handshake
Jul  6 14:26:33 mail postfix/smtp[3664]: 637401B000FB: lost connection with 163mx02.mxmail.netease.com[220.181.12.90] while performing the EHLO handshake
Jul  6 14:27:11 mail postfix/smtp[3663]: 17D3A1B000F8: to=<zlz7803@163.com>, relay=163mx03.mxmail.netease.com[220.181.12.61]:25, delay=82536, delays=82329/0/206/0, dsn=4.4.2, status=deferred (lost connection with 163mx03.mxmail.netease.com[220.181.12.61] while performing the EHLO handshake)
Jul  6 14:27:14 mail postfix/smtp[3664]: 637401B000FB: to=<zlz7803@163.com>, relay=163mx04.mxmail.netease.com[220.181.12.84]:25, delay=74354, delays=74145/0.01/209/0, dsn=4.4.2, status=deferred (lost connection with 163mx04.mxmail.netease.com[220.181.12.84] while performing the EHLO handshake)
Jul  6 14:32:09 mail postfix/postfix-script[3697]: refreshing the Postfix mail system
Jul  6 14:32:09 mail postfix/master[3448]: reload configuration /etc/postfix
Jul  6 14:32:09 mail postfix/qmgr[3701]: 719A41B000EF: from=<zhangliping@wztimes.com.cn>, size=37416, nrcpt=1 (queue active)

如何才能使用?