Recently we have a had a some outbound messages fail to reach their destinat
ion but the internal senders have not received any notofication. When I trac
ked 2 of the messages in question using the tracking center in Exchange I fo
und 1 message only got as f
ar as being SMTP: Message Submitted to the Categorizer and then no more info
 and the 2nd got as far as SMTP: Started Outbound Transfer.

Neither message got as far as Message Transferred. I know that these are goo
d email addresses. The intended recipients report no problems receivig email
 from other senders.

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