How does Stealth Spam Control work?
Stealth works by scanning your messages as they come into our mail server. Stealth assigns points to specific terms and phrases. For instance if your incoming email message contains the words “you’ll be amazed”, Stealth assigns 1.077 points, and “for only [some sum of cash]” gets 0.201 points. If the message has been assigned more points then your threshold, the message is considered Spam and rejected (or marked as Spam, depending on your personal settings).