You can enjoy encrypted mail. Using group mode you can send encrypted mail.
Twofish encryption algorithm is used for encryption, with 56 bit key.
This is a sample of Protected Communication System (Mail-E)
The characteristics of "Protected Communication System (Mail-E)" are as follows.
1. Multiple encryption.
2. User makes free length encryption key.
3. Easy to change the encryption software.
By the currency restriction, I can not upload "Protected
Communication System (Mail-E)" to the Internet.
If you are living in Japan, you can use this mailer. You can not carry
out this mailer from Japan to a foreign country.
If you are living in Japan, you can get "Protected Communication System

(Mail-E)" from "SoftHouseNao" by post.
We can not to send CD-ROM to foreign country. You must be living in
Japan.
If you have any question, please e-mail to "SoftHouse_Nao@yahoo.co.jp".
E-mail on a technical question should be send to the author "Uyama
Yasumasa" mail address is "uyama@kc4.so-net.ne.jp".
The usable algorithm are Twofish, AES(Rijndael), RSA and block type
encryption software.