Consider the following scenario. In an Exchange Server 2007 Service Pack 1 (SP1) environment, you use the condition when the Subject field or the body of the message contains specific words to create a transport rule. However, Exchange Server 2007 SP1 matches the character pattern specified instead of an actual word. For example, you define "dog" as the specific word. If any word contains the characters "dog" in a message, such as "ddog," or tfdogk," Exchange Server 2007 SP1 considers that the string matches the condition.
If you configure the transport rule with the action send bounce message to sender with enhanced status code in this scenario, the sender receives a non-delivery report (NDR) that resembles the following message.
From: <PostMaster> Sent: <Date, Time>To: <Sender>Subject: <Subject>Delivery has failed to these recipients or distribution lists:<recipient>Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator. _____ Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators:Generating server: <Server><recipient>#550 5.7.1 Delivery not authorized, message refused ##Original message headers:
To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. For more information about Update Rollup 9 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: