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Exchange 2007: Outgoing mail stuck in  queue

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Last Modified: 2013-11-30
Only when sending mail with an attachment, in this case only 15MB. (Users have no limits defined (limit boxes are un-checked) -- System wide limit is set at 30MB in Org Config -> Hub Transport -> Transport Properties  for both send and receive.)

Queue viewer on the 2007 Exchange Management console shows the messages sat in a queue to.......

cn-first routing group,cn=routing groups,cn=first administrative group,cn=administrative groups,cn=domain,  etc etc

with a delivery type of SmtpRelayToTiRg status retry.

User gets a 'delayed for 4 hours' message and then a final NDR when the delievery time expires.

Exchange 2007, running on Server 2008 sp1
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