vpopmail + filtering

[James]

Has anyone successfully filtered mail that was delivered to
a vpopmail account? I've taken a previously working procmail
filter and tried it out with my vpopmail account, and it
just writes the same message to the maildir over and over.
I've modified it to point to the proper location of my
mailbox of course. I also tried the filtering capabilities
in sqwebmail, following the directions that came with it. It has
the same result. Has anyone had better luck with this?