Microsoft Exchange weirdness kills my morning

I usually don’t write about geeky problems. However I just lost the entire morning troubleshooting a weird situation with Microsoft Exchange 2003 and I’d like to understand it. If I asked you to read this, read on…

The problem was that Exchange’s POP3 connector was saying it had retrieved a user’s email and delivered it into their mailbox. However when we looked in the mailbox, the email wasn’t there. Nor was it in any of the “undeliverable” queues. Nor were there any error messages. I think I’ve solved it — or at least figured out a workaround — but I’d like to understand Exchange’s behaviour here. So here goes…

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