We are continually receiving "junk mail" (spam) from Bitcoin, and despite numerous requests on our part to Yahoo Mail to block this sender, and numerous unanswered emails to Bitcoin Coin to "cease and desist", their junk mail . . "keeps on keeping on". Yahoo Mail has failed to enforce numerous requests on our part to "block sender". Bitcoin's high-handed disregard of our numerous email requests to "stop sending us junk mail" have been totally disregarded. We would greatly appreciate it if Yahoo could permanently block this sender's "junk mail". Thank you, [protected]@yahoo.com Your attention to this matter would be greatly appreciated. Thank you. [protected]@yahoo.com