In Exchange 2010, you can use retry-queue to do that.
Use the Retry-Queue cmdlet to force a connection attempt for a queue on a computer that has the Hub Transport server role or the Edge Transport server role installed.
Related document for you:
Retry-Queue
http://technet.microsoft.com/en-us/library/bb124081(v=exchg.141).aspx
Thanks,
Evan
Evan Liu
TechNet Community Support
