Exchange 2007 Retry Messages in Queue

In exchange 2007 you can view all messages in your queue by using the Get-Messages cmdlet. To view all message queues use Get-Queue. Exchange creates a seperate queue for each outbound domain. To retry particular messages to a particular domain you can use the Retry-Queue command.

To retry an individual message use Resume-Message. To resend all messages use:

Get-Message Resume-Message

This is the most practical command.

For more information check out:
http://technet.microsoft.com/en-us/library/aa995987.aspx

To check out whats happening with SMTP loggigng with the email in your queue check out:
http://clintboessen.blogspot.com/2009/06/exchange-2007-smtp-protocol-logging.html