we need a decentralised crypto email network.
Email is already decentralized in the sense that anyone can set up their own mail server. Any email can be encrypted too with PGP regardless of the provider.
However we have a p2p messaging system but I wouldn't recommend it yet until it's a few years older. When it comes to crypto it needs to be studied for a few years before we know if its safe and know all the risks:
http://bitmessage.orgWe could do with a better one though, bitmessage has a lot of design flaws and doesn't scale well at all.