Contributed by Dengue on from the e-mail-security-tools dept.
"Caesarion is a professional quality, open source, 64-bit clean and completely free E-mail security tool for the FreeBSD, OpenBSD and Linux operating systems. The software provides communications secrecy, user authentication and data integrity verification. Caesarion is very simple to use and comes with complete documentation and examples showing how to use it. http://www.rcarey.org/cion.html "
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