Anti Spam Extensions

Hey!
I have a few mandatory accounts in my Thunderbird client. These accounts
receive an atrocious amount of spam. I was wondering if anyone had any
recommendations for spam filters on the client side. The machine I'm working
on is WinXP. Any idea's for Thunderbird extensions or even maybe new e-mail
clients are appreciated.

Thank you,
-Kurt

-- 
/***************************************
*     Kurt Mathews
*     axkim@uaa.alaska.edu
*     k@uaa.alaska.edu
****************************************/
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