Yes, the antispam utilities on our servers include:
- Real-time blocking lists - messages from known spam sources are blocked at the SMTP level.
- SpamDyke/graylisting - filtering messages at the SMTP level based on DNS checks.
- SpamAssassin - content filtering based on predefined rules as well as blocking lists, including Bayesian classifier, allowing customers to mark messages as spam or ham by moving them to and out of the Junk Mail folder.
- Custom header filters that each of our customers can set to block messages from specific sources, or matching specific patterns.
More information about the anti-spam tools we offer is available in our spam protection documentation.