[Mailman-Users] Unable to Find Bogus User

I've started to get an error message back from the monthly reminders. The gateway is reporting that:

"Your message could not be delivered to:

dawn norris,University of Maine (The name was not found at the remote site. Check that the name has been entered correctly.)"

Fair enough. It's not an e-mail address, there's no reason why the server SHOULD be able to deliver it. But I can't find the bad entry. Find_member for 'dawn,' 'dawn Norris,' and 'University of Maine' are all coming back with nothing found. How do I locate this incorrect entry?

Bill