pop3 email won't download messages with .wma attached

[jntdroid]

I use pop3 to get my work email (we don't use Exchange). When we have a voicemail, we are sent an email with a .wma file attached, which is the voicemail. The Droid ignores these messages on our pop3 server, and I can't figure out why. I've looked all through all of the settings to see if there was an attachment cap, or anything along those lines, but nothing. Is anybody else dealing with something similar, or have any thoughts?