Generally, “Anti Spam” could help you to clear your mailbox from different kinds of advertising and obscene emails, but the number of success rate is depends on the rules and principles the providers set.

Most of the Email Service Providers use the following procedure to verify the Spam Email:

1. Verify OpenRelay (ORDB.org)
2. Verify the Public Blocked list (spamcop.net, mail-abuse.org)
3. Verify DCC list (rhyolite.com)
4. Verify Pyzor &Razor list
5. Apply Bayesian auto learning & filtering.

However, technology is developing rapidly nowadays. Relying on the “Anti Spam” procedure as we mentioned above is not enough.