Exchange使用海外邮件中继被对方550硬退信，反垃圾误判
今天有个客户给我们发邮件说遇到下面的问题，很奇怪。我们经过分析使用的是海外邮件中继
From: Mail Delivery System [mailto:MAILER-DAEMON@relaypod.com]
Sent: Monday, December 30, 2013 1:50 PM
To: Frederic LE-DU
Subject: Undeliverable: FW: Suzhou Tool for PN 27947-1/01
Delivery has failed to these recipients or distribution lists:
Bob.Gallagher@hutchi.com
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
The following organization rejected your message: smtp2.hutch.com.
Diagnostic information for administrators:
Generating server: us.relaypod.com
Bob.Gallagher@hutchi.com
smtp2.hutchinsonssi.com #
经过我们彻底的分析是由于对方的反垃圾策略给误判了。
The following organization rejected your message: smtp2.hutchi.com 这个服务器给的拒绝信息，并不是我们给的
#5.0.0 smtp; 550 Rule imposed mailbox access 这个是退信原因：550是硬退信，对方的规则拒绝。至于什么规则对方没有给出。
一般情况是内容中有关键字触发了对方的反垃圾规则，建议修改内容在重新发送。