Any good free Anti-spam software for Thunderbird?

[Ashwin]

I am looking good free Anti-spam software for Thunderbird, should work alongside Avast 5 Home.

I tried Spamihilator , it doesnt work , conflicts with Avast Mail Shield.

Also tried Spamfighter, was working fine earlier, not anymore.
Maybe it doesnt work with the version of Thunderbird which was released yesterday.



Update: I have re-installed Spamfighter, it works now. But I would still like to know if any alternatives are available.

Also, does Spamfighter support Gmail IMAP in thunderbird. I see only Hotmail being filtered and I think its because of POP forwarding