A Non-Delivery Report is generated when you try to send a high priority message that is larger than 250 KB in an Exchange Server 2007 Service Pack 1 environment

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SYMPTOMS

On a server that is running Microsoft Exchange Server 2007 Service Pack 1 (SP1), you can set the following value in the Edgetransport.exe.config file to control the processing for high priority messages:

"PriorityQueueingEnabled" value= "True"

However, after you do this, you cannot send a high priority message that is larger than 250KB. Additionally, a Non-Delivery Report (NDR) that resembles the following NDR is generated:

Delivery has failed to these recipients or distribution lists:

<send's address>
This message exceeds the maximum message size allowed. Microsoft Exchange will not try to redeliver this message for you. Please make the message smaller -- by removing attachments, for example -- and try sending it again, or provide the following diagnostic text to your system administrator.
  _____  
Sent by Microsoft Exchange Server 2007 

Diagnostic information for administrators:
Generating server: <transport server name><sender's address>
#550 5.2.3 QUEUE.Priority; message too large to be sent with high priority ##
Original message headers:
Received: from <mailbox server name> ([<IP address>]) by <transport server name> ([<IP address>])
 with mapi; <Date, Time>
MIME-Version: 1.0
Content-Type: text/plain
Date: <Date, time>
Message-ID: <<ID>@<server name>>
Subject: <subject>

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CAUSE

The MaxHighPriorityMessageSize parameter controls the maximum size of a high priority message. The default value is 250 KB. If a high priority message is larger than the value of the MaxHighPriorityMessageSize parameter, the message is automatically downgraded from a high priority message to a normal priority message. However, there is a problem when the message is processed, and you receive an NDR.

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RESOLUTION

Download and install Update Rollup 5 for Exchange Server 2007 Service Pack 1.

For more information about Update Rollup 5 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:

Description of Update Rollup 5 for Exchange Server 2007 Service Pack 1 (http://go.microsoft.com/fwlink/?LinkId=152553)

For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:

How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007 (http://go.microsoft.com/fwlink/?LinkId=152570)

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