Undeliverable notice when part of distribution list

Has anyone ever heard of this?
When I send a message to a distribution list on our Exchange 2003 system I get an "undeliverable" message for only one recipient. The message is:
The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.

However, I know the user does receive the messages because she sometimes replies to the very email that generated the message. Also, if I send something to her individually rather than as part of a distribution list I do not receive the "undeliverable" notice. I have tried removing her from the distribution list and then putting her back, so I know the address in the list is from the Global Address Book - the same account I send to individually with no problem.
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apache09Connect With a Mentor Commented:
What version of Office are you using?
Check that you have the latest Service pack installed for your Office Suite.

Try updating your offline address book (go to send / recieve > download offline address book).  Also try from OWA if available
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