Best Java library for parsing email messages?

I want to write a spam filter in Scala. This involves reading in email
messages stored on disk. Rather than mucking around with regexes, is
there a Java library that will extract this stuff automatically?

The Apache Commons Email library only deals with sending email. The
Java Mail library only lets you deal with messages downloaded from a
POP3 account.

Basically I want something functionally equivalent to
http://www.python.org/doc/2.2.3/lib/module-email.Parser.html I can use
from Scala. Thanks!

Warren