[Dovecot] Help with Outlook2003 hanging on receiving email with attachments

I have one user running Outlook 2003 that hangs up when receiving emails with attachments. He is connecting using POP3. It's almost as if something is timing out and closing the connection. The client is on a 1500/256 DSL connection and the server is on a 768/768 fractional T-1. I have other users that connect with Outlook/POP3 without any problems. I have done a fresh install of Windows/Outlook to make sure it's not a client machine problem. Any help or ideas are greatly appreciated.