The case for encrypted communications has been in the news quite a bit lately. Many ways to encrypt your email exist, with the use of PGP in the client and the ability for digital signing of messages to prove their authenticity and that they have not been tampered with being the most popular and probably oldest one. But there are a few more custom, and at a higher service level commercial, services on the market. Most of them are also using PGP but absolve the end user from the task of setting this up themselves.
