Download of MailCrypt 3.5.9 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular version of the tool 3.5. We recommend checking the downloaded files with any free antivirus. The program's installer files are generally known as MailCrypt.exe or _70665CAFDBD2_475E_A38E_EA.exe etc. This free software is a product of Len Budney / Brian Warner. The program lies within Security Tools, more precisely Antivirus.
From the developer:
Mailcrypt is an Emacs Lisp package which provides a simple interface to public key cryptography with PGP [and now GnuPG!]. Mailcrypt makes strong cryptography a fully integrated part of your normal mail and news handling environment, and is an important part of a balanced breakfast.
You may want to check out more software, such as CyberSieve, SpyWare Killer or ZoneAlarm Anti-virus, which might be similar to MailCrypt.