IMail Premium includes Premium Antispam technology by Commtouch.
All members of the IMail product family also include standard antispam features. The antispam features are custom configured by the administrator to identify spam and prevent it from clogging your inbox. Mail messages are passed through several layers of filters and tests to assure that maximum spam detection is achieved.
The Premium Spam Filter performance can be improved when users forward spam e-mail to Commtouch. Commtouchs' editors review the spam submission and add spam signature information to it; then the signature is published to the global database to help other users eliminate spam.
After installing you can access the Antispam settings by clicking the Antispam tab in IMail Administrator. The Domain Level Spam Filter page appears.
To access the Premium Antispam settings(available only with IMail Premium), click the Premium Filter link.
To access Premium Antispam Service settings go to Services > Antispam.