SecExMail Home 

SecExMail makes e-mail encryption as easy as sending a message. There are no plugins necessary and it will work with any standard email client including Microsoft Outlook, Outlook Express, Calypso, Eudora and many more. Includes html email filters.
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Cynapse MailCryptor 

MailCryptor is an e-mail encryption solution, which enables the user to encrypt e-mail messages. MailCryptor works on a 128-bit symmetric encryption algorithm, which ensures the right balance between security and speed of decryption.
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