Free software 20: Anti-spam

Spams are quite annoying and are deep in our email box. I receives at least 20 junk mails everyday. A good way is to choose a good email provider, like Yahoo, Google, or Hotmail. If you prefer to use your email clients, here are the free choices to enhance the antispam function provided by the email clients. (I know there are some other free antispam softwares. But I won't introduce the free software that has non-free brothers or sisters.)

(I haven't tried them all, but I think the first 3 should be reliable.)

• Trend Micro Anti-Spam
  It works with Outlook and Outlook Express.
  The download link is:
  For Outlook Express http://www.trendmicro.com/ftp/products/antispam/tmas35-oe.exe
  For Outlook http://www.trendmicro.com/ftp/products/antispam/tmas35-ol.exe
• Agnitum Spam Terrier
  It is still in publick testing.
  The official website is http://www.agnitum.com/lp/spam-terrier.php
• Comodo AntiSpam
  The official website is http://www.comodo.com/home/download/download.php?prod=anti-spam
  
• AntiSpam Sniper Pro
  It is available at http://www.bestsecuritytips.com/content+index.id+6.htm
• ASB AntiSpam
  The official website is http://asbsoft.netwu.com/