The following deployment prerequisites are required to use the Anti-Spam feature:
Purchasing an Anti-Spam license for the firewall can be done directly through MySonicWall.com or through your reseller.
Your SonicWall network security appliance must be registered with MySonicWall.com before use.
To purchase an Anti-Spam license
http://www.MySonicWall.com
in the location or address field.