大家好，不知大家可曾遇到邮件丢失的问题？

我的服务器基本上稳定、正常的运行，每天收发几千封邮件，可能99。9％的信件都可以正常收发，但是就有那么一小撮……

总有几个用户抱怨发送到几个外国用户的邮件经常发生丢失，别人收不到，自己也没有退信。
我跟其中一个网管每天发测试邮件，发了两周，也没有丢失过，但又有人发另外公司邮件丢失，真是头痛啊

我测试过dns，路由，对方端口的服务等，都没有发现什么异常，现在找了邮件服务器的日志，希望能有线索。

大家在这方面有什么经验么？
声明，几乎没有人反映有收不到邮件的，也就是说别人给我发都可以成功的。

还有，发送失败的邮件是否都会给用户发失败的声明信呢？需要特殊的设置么？

我也会遇到过类似的问题，不过大多数是发到国外的邮件，不太好解决

我的是发到aol.com时收不到，又没退信。
下面是我的日志,你们的日志呢？发上来看看，我们一起研究出了什么问题吧？

大家帮我看看有什么问题好吗？对方地址是正确无误的。

Tue 2004-03-16 23:43:58: [-1:4311:1] Parsing Message
Tue 2004-03-16 23:43:58: [-1:4311:1] From: huagai@contour.cn
Tue 2004-03-16 23:43:58: [-1:4311:1] To: kingchao@aol.com
Tue 2004-03-16 23:43:58: [-1:4311:1] Subject: testing
Tue 2004-03-16 23:43:58: [-1:4311:1] Message-ID:
Tue 2004-03-16 23:43:58: [-1:4311:1] MX-record resolution of [aol.com] in progress (DNS Server: 202.96.134.133)...
Tue 2004-03-16 23:43:58: [-1:4311:1] P=015 D=aol.com TTL=(46) MX=[mailin-04.mx.aol.com] {64.12.137.184}
Tue 2004-03-16 23:43:58: [-1:4311:1] P=015 D=aol.com TTL=(46) MX=[mailin-03.mx.aol.com] {64.12.137.152}
Tue 2004-03-16 23:43:58: [-1:4311:1] P=015 D=aol.com TTL=(46) MX=[mailin-02.mx.aol.com] {64.12.138.89}
Tue 2004-03-16 23:43:58: [-1:4311:1] P=015 D=aol.com TTL=(46) MX=[mailin-01.mx.aol.com] {205.188.159.57}
Tue 2004-03-16 23:43:58: [-1:4311:1] Attempting MX: P=015 D=aol.com TTL=(46) MX=[mailin-01.mx.aol.com] {205.188.159.57}
Tue 2004-03-16 23:43:58: [-1:4311:1] Attempting SMTP connection to [205.188.159.57 : 25]
Tue 2004-03-16 23:43:58: [512:4311:1] Waiting for socket connection...
Tue 2004-03-16 23:43:59: [512:4311:1] Socket connection established (61.144.222.47 : 3330 -> 205.188.159.57 : 25)
Tue 2004-03-16 23:43:59: [512:4311:1] Waiting for protocol initiation...
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220-rly-yg02.mx.aol.com ESMTP mail_relay_in-yg2.4; Tue, 16 Mar 2004 10:47:35 -0500
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220-America Online (AOL) and its affiliated companies do not
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220- authorize the use of its proprietary computers and computer
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220- networks to accept, transmit, or distribute unsolicited bulk
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220- e-mail sent from the internet. Effective immediately: AOL
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220- may no longer accept connections from IP addresses which
Tue 2004-03-16 23:44:00: [512:4311:1] <-- 220 have no reverse-DNS (PTR record) assigned.
Tue 2004-03-16 23:44:00: [512:4311:1] --> EHLO contour.cn
Tue 2004-03-16 23:44:01: [512:4311:1] <-- 250-rly-yg02.mx.aol.com peer name unknown
Tue 2004-03-16 23:44:01: [512:4311:1] <-- 250 HELP
Tue 2004-03-16 23:44:01: [512:4311:1] --> MAIL From:
Tue 2004-03-16 23:44:02: [512:4311:1] <-- 250 OK
Tue 2004-03-16 23:44:02: [512:4311:1] --> RCPT To:
Tue 2004-03-16 23:44:06: [512:4311:1] <-- 250 OK
Tue 2004-03-16 23:44:06: [512:4311:1] --> DATA
Tue 2004-03-16 23:44:07: [512:4311:1] <-- 354 START MAIL INPUT, END WITH "." ON A LINE BY ITSELF
Tue 2004-03-16 23:44:07: [512:4311:1] Sending to [205.188.159.57]
Tue 2004-03-16 23:44:07: [512:4311:1] Transfer Complete.
Tue 2004-03-16 23:44:07: [512:4311:1] <-- 250 OK
Tue 2004-03-16 23:44:07: [512:4311:1] --> QUIT
Tue 2004-03-16 23:44:08: [512:4311:1] <-- 221 SERVICE CLOSING CHANNEL
Tue 2004-03-16 23:44:08: [512:4311:1] SMTP session successful, 1052 bytes transferred.
Tue 2004-03-16 23:44:08: ----------