E-mail troubles at SU?

For at least the past week, I've been having trouble with Mail.app and SU's e-mail service. I can't seem to delete any e-mail. Here's an example of an error message:

The message “3-on-3 Tournament Deadline Approaching!” could not be moved to the mailbox “(null)”

The folks at IC don't seem to think there's a problem at their end. Is anyone else having issues, or is it just me?