Mailpile is an open source mail client that focuses on encryption and users privacy. Mailpile makes the PGP setup easy, it allows you to create PGP keys directly in the email application and send PGP encrypted messages. In this tutorial, I will guide you trough the Mailpile installation on Ubuntu 15.10. We will install Mailpile as a web-based client with Nginx as a reverse proxy.
Read more at HowtoForge