saving an e-mail attachement

[robinsiebler at gmail.com]

I'm trying to figure out how to save an e-mail attachment from a POP3
mailbox.  I've scoured the web, but -none- of the examples I have
found have actually worked.  For instance, in this example:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/8423cad79ff21730/0d8922943a164ccf?lnk=gst&q=email+attachment#0d8922943a164ccf,
fn is always None, but the e-mail -does- have an attachment (an xml
file).