Looks like the emails are being sent using rescans. One of the reason this could happen is if BES Server fails to process the UDP message that Exchange server sent to MAPI clients (in this case BES).
Any firewalls? Is BES and Exchange is the same LAN?
Any latency issues?
Any performance issues on Exchange or BES?
can you confirm from MAGT logs if you see lots of strings like "rescan"
Hope this gives you a start!
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