Computational Spam-Fighting: No Major Infastructure

• No money is charged under the computational approach. In addition to unpopularity in the user community, charging money for e-mail involves major infrastructure changes (e.g. micropayment support).
• No challenge-response mechanism is required. Unlike challenge-response approaches, we do not require additional communication between the sender and the receiver.
• No third party is required for electronic mail communication.
• Control of mail servers remains as it is now. With users and their delegates.
• Once in place, virtually no maintenance is needed (unlike spam filters that need constant updates).