From within Exchange Administrator, select Connectsion, Internet Mail Service, Properties, Queues TAB. You can choose the queue you want to view. This will also show you the details about the msg, sender, recipient etc.
YOu can also view the queue length by using Performance Monitor. You could then set alerts to notify you of excessive queue length, etc.
I am not aware of any 3rd party (or ResKit tools) which will let you view the Queue).
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How to view Exchange Internet Mail Servi