Another overlooked solution is from most ISP's. Most have some
form of Spam blocker. Mine, (Mindspring) has the BrightMail service.
Daily it intercepts 100-150 spams. Unfortunately, you need to turn
the Spam blocking on for most providers (Bellsouth, etc). Usually
it is found on the ISP's Webmail webpage and has differing levels
of filtering.
About Norton Anti-Spam - It basically captures known Spam, then
attaches a [Norton Anti-Spam] to the header and dumps them into a
special folder. They currently have an issue where an unidentified spam
will crash Outlook Express if you attempt to mark it as spam.(R-Click).
Also, it doesn't have an automatic purge on exit setting. So users will
have to manually dump the contents of the Spam folder.
For the cost $30, I would have to give Anti-Spam a thumbs down
until Symantec fine tunes it.