CryptPlugin Description:

CryptPlugin is a plugin for Eudora Mail Clients Version 3.x, 4.x and 5.x .
CryptPlugin will encrypt a given message using RSA RC2 block cipher or
RC4 stream cipher.

First you choose a password and a encryption algorithm, and CryptPlugin
will automatically encrypt and encode the selected message.

After this, the message can only decrypted and read by a recipient
who has already CryptPlugin installed and knows the encryption key.

CryptPlugin is an easy and fast way to add powerful encryption/decryption
capabilities to Eudora mail.