How does Spam Arrest work? What are its main characteristics? What are its main advantages? What are its main disadvantages?

Hardware/Software Setup Required
Spam Arrest (available at http://www.spamarrest.com/)

Problem Description
Spam Arrest is a tool used to protect e-mail accounts against spam. It uses challenge/response technology. Go to the Spam Arrest Web site and read more about it. Then, write a brief report explaining how it works, its main characteristics, and at least five advantages and five disadvantages of Spam Arrest.
Estimated completion time: 60 minutes.
Outcome
A brief report explaining how Spam Arrest works, including its main advantages and disadvantages
Validation/Evaluation
How does Spam Arrest work?
What are its main characteristics?
What are its main advantages?
What are its main disadvantages?

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