我在Exchange 2007的队列视图中看到了不less“421 4.4.2连接丢失”错误。我已经validation了rDNS，并且正确设置了这些错误。 我已经重新启动。 这不是所有的领域，只是less数。
当我查看数据包时，我从SMTP服务器获得的最后一个命令是“SMTP服务器就绪”
174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 220 mail.ntgrated.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Thu, 15 Mar 2012 09:58:11 -0500 , 119 bytes 172.16.2.178 174.47.59.19 SMTP SMTP:Cmd EHLO mail.serviceprovidergroup.com, 36 bytes 174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 250 -mail.ntgrated.com Hello [69.128.140.103], 334 bytes 172.16.2.178 174.47.59.19 SMTP SMTP:Cmd STARTTLS, Server is currently able to negotiate the use of TLS 174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 220 2.0.0 SMTP server ready, 29 bytes 174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 220 mail.ntgrated.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Thu, 15 Mar 2012 09:58:12 -0500 , 119 bytes 172.16.2.178 174.47.59.19 SMTP SMTP:Cmd EHLO mail.serviceprovidergroup.com, 36 bytes 174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 250 -mail.ntgrated.com Hello [69.128.140.103], 334 bytes 172.16.2.178 174.47.59.19 SMTP SMTP:Cmd STARTTLS, Server is currently able to negotiate the use of TLS 174.47.59.19 172.16.2.178 SMTP SMTP:Rsp 220 2.0.0 SMTP server ready, 29 bytes 而当比较通过另一个域名的电子邮件时，我看到了全面的沟通：
172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 220 mail.serviceprovidergroup.com Microsoft ESMTP MAIL Service ready at Thu, 15 Mar 2012 11:00:31 -0400, 105 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Cmd EHLO se-10-1-10-1.localdomain, 31 bytes 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 250 -mail.serviceprovidergroup.com Hello [69.128.140.110], 191 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Cmd MAIL FROM:<do-not-reply@localdomain>, 38 bytes 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 250 2.1.0 Sender OK, 21 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Cmd RCPT TO:<[email protected]>, 46 bytes 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 250 2.1.5 Recipient OK, 24 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Cmd DATA, Begins message composition 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 354 Start mail input; end with <CRLF>.<CRLF>, 46 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Data Payload, 1448 bytes ... 69.128.140.110 172.16.2.178 SMTP SMTP:Data Payload, 107 bytes 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 250 2.6.0 <[email protected]> Queued mail for delivery, 100 bytes 69.128.140.110 172.16.2.178 SMTP SMTP:Cmd QUIT, Terminates the mail session 172.16.2.178 69.128.140.110 SMTP SMTP:Rsp 221 2.0.0 Service closing transmission channel, 48 bytes
我可以telnet到这些域，并手动执行命令整天，它通过，只有在Exchange中发送。
这个周末我们升级了Fortigate防火墙的时候就开始了，但是我找不到任何会导致这些问题的东西。
使用ping（除非有更好的方法），我已经确认数据包不会在两者之间下降。
谢谢