Better plan
If the botnet operators and junkmail peddlers are thwarted in this manner, they will only seek other means to accomplish their goal. Any benefits would only be temporary. The way to stop them once and for all is to remove their incentive.
Why do spammers spam? Because it is so immensely profitable. But if all the online merchants who hawk their wares were to be banned by the banks and credit card companies, how much of their stuff would they sell if the customers had to go to the post office to get a postal money order for every purchase they made? The scourge of junkmail would come to a screeching halt. But the politicians who make the laws have no intention of putting a stop to such devious practices. They only want to give their constituents the impression that they do.
