Yup. We've been in open beta for a long time (contacted some of the same folks/ppl that they do)... wondering if we inspired them ;). Flattered if so. We like CC - they're good people.
So Canada has this option, and a commenter above said Germany does. Why does the US not have this?
What's even sadder is I cannot fathom how you guys have this option. The US has literally grown up with junk mail - it's always about 99% of mail and we cannot fathom what life is like on the other side!
Ditto with Denmark. Although we have to register our opt-out with the postal service, and then we receive a special sticker to put on the mailbox. There are have even been talk about changing junkmail to opt-in instead.
CC are pioneers & we have a lot of respect for them. We'd be delighted if we grew to a 10th of their user base. But i can assure you that we came up w the mobile junk mail zapper idea entirely on our own. edit: clarification.