The mendelson OFTP2 is a JAVA-based open source OFTP2 solution. It contains a logging- and configuration GUI (SWING) and supports encryption, digital signatures, message compression, TLS, certificate exchange, message routing, mail notification
Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system.
Visit http://hwmail.sourceforge.net/ for more information.
...Write a normal e-mail, click 'Encrypt?' Checkbox, then write Question and Secret Answer.
4. Click Encrypt + Send button.
5.Reader should click on the link, answer the question, then COPY & PASTE only the encrypted message in the textbox.
Visual instructions in project webpage.
Email client & server with clustering support. Program focuses on data processing and management – the archiving, sending, receiving and encryption of e-mail messages with the related management of accounts. Functionality divided into server and client
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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.
An API and test suite, or possibly an application unto itself, to manage keys and allow mail user agents (such as pine or mutt) to use encryption and authentication systems (such as S/MIME) via the services of external encryption suites (such as OpenSSL)