"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>