This is an email client written in Java, using Swing and JavaMail. It supports IMAP (including
disconnected IMAP), POP3, and unix-style mbox folders. It also has (alpha) support for encryption using PGP and S/MIME.
With Tiger Envelopes you can stop snoops from reading your email. Same email client. No extra steps. One click to install on Windows and Linux. Configures Outlook, Thunderbird, and KMail. Supports GPG, PGP, Bouncy Castle encryption.