Munich-based Company Ciphire Labs today released a new version of their "Ciphire Mail". This is an email-encryption tool, which uses standard, well-known cryptographic algorithms. It works in conjunction with your existing email client. Ciphire Mail operates seamlessly in the background and does not interfere with normal emailing routines. It encrypts and decrypts email messages, and can digitally sign each message to provide authentication and guard against identity theft. Ciphire Mail is the first out-of-the box solution to match power with ease of use.

Read more at source.

Downloads can be found here, runs on Windows, Mac & Linux!