If you are using Outlook, I would suggest using spambayes to filter your mail. If you decide to use spambayes, set the threshhold for spam and possible spam to large percentages. For example, in my set up, if spambayes is 99% sure that an email is spam, then the email is moved into the spam folder. If spambayes is 80% sure that an email is spam, then the email gets moved into the "possible spam" folder. Everytime you mark an email as spam, spambayes will "learn" and adapt. it is a seriously phenomenal piece of software.