问题描述：

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1. 某些邮件会滞留在队列里并无法被送达目的地。

2. 重启Exchange服务器之后，一些很老的邮件会被发送，并且一些内部用户会收到NDR通知。

解决方案：

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安装KB 950757：

E-mail senders do not receive an indication that some messages have been held by Exchange Server 2003 until the SMTP service, the Microsoft Exchange Information Store service, or the Exchange server is restarted

http://support.microsoft.com/kb/950757/zh-cn