In order to send an email, the sender first has to solve a math problem. Legitimate activities suffer an indiscernible delay, but illegitimate activities that r

In order to send an email, the sender first has to solve a math problem. Legitimate activities suffer an indiscernible delay, but illegitimate activities that require massive volume are hobbled. Illegitimate activities are often carried out in a parasitic manner using infected and hijacked equipment for which the spammer and attacker don't have to pay. This will do little to hinder those tactics.