How to deal with mailing list spam?

[Chris Purves]

I was wondering what is the best way to deal with spam that comes 
through on mailing lists?  For mailing lists like spamassassin I 
whitelist all mail because I expect to see examples of spam, but for 
other lists, is it a good idea to run 'sa-learn --spam'?  What about 
reporting those spam to razor/pyzor or spamcop?

--
Chris