text: A couple of years ago I was having tremendous problems with a previous internet service provider that sent junk mail from their worm infested mail server...I used a program called mailwasher that used to be available for free at www.mailwasher.net. Basically this program shows you what's on the server before you download it to your email client and has a built in 'blacklist' of known spammers and such but you can choose to block/blacklist or bounce messages or do all three. By bouncing messages and adding them to the blacklist, you do 2 things, you tell mail washer to mark that message as spam if it comes in again and if you bounce it, chances are that you will be automatically removed from the list that is sending the messages.  One click and the unwanted spam is deleted and you dont have to download it at all to your computer. It really helped clear out my inbox, however, since switching ISPs, I dont have that much of a problem and I also use Thunderbird available at mozilla.org and set up message filters which work well.