Bitmessage is a decentralized and trustless communications protocol, meaning that you need-not inherently trust any entities like root certificate authorities. It uses strong authentication which means that the sender of a message cannot be spoofed, and it aims to hide "non-content" data, like the sender and receiver of messages, from passive eavesdroppers like those running warrantless wiretapping programs.
Looks quite interesting. I wish it well. BM-2cTZuymbD7ch2Am9YWhvLu2Q9bDi1aisHZ