http://www.forbes.com/sites/hollieslade/2014/05/19/the-only-email-system-the-nsa-cant-access/
Saw this article today, thought it might be of use to many of those who frequent the board. Haven't given it a look yet myself... But thoughts on its viability, especially for sellers?
Blatantly false advertising.
Any entity, imbued with sufficient levels of determination, may be considered unstoppable. If the NSA wants in, they will (eventually) get in.