What I would do is go download a packet sniffer like Ethereal and capture the packets on the network as you attempt to send a message.
The message should obviously be routed to your exchange server, then the exchange server should attempt to make a request to find the MX record of the dns...
When you say you "moved 1GB out to a PST file," do you mean that you use ExMerge to move them out?
Try defragging with PerfectDisk 7.0 available here:
http://www.raxco.com/products/pd2kexch/
enjoy
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