Not effective, by design – PaperKarma - Stop Junk Mail Review

This developer may very well send a desist request to junk mailers on your behalf, but what they hope you don’t know is that those mailers are not legally obligated to honor a request by someone else on your behalf. They’ll take your money and perform a service, but be aware that their service could have literally no effect on the amount of junk mail you receive.
Review by Oldthinker on PaperKarma - Stop Junk Mail.