Major email providers like Gmail, Hotmail, and AOL have dramatically improved their spam filters in recent years. However, if you're receiving a disruptive level of unwanted communications, effectively web-based anti-spam solutions are available.

Google's postini is one of the best out there as anti-spam solution. You can easily integrate it with an existing email service. Postini is my favorite as a blogger in combating spam, viruses, phishing, denial of service and other attacks.

Postini will basically monitor your email through its gateway, preventing spam from ever reaching your inbox.