There are several common threats that affect the personal, private and confidential nature of Email communications.
The entire document is available in Adobe's pdf format Reducing Email Threats
MyMailSM can be configured to eliminate administrative access to user’s passwords, which prevents unauthorized access to mail messages and mail boxes. Further, since all Email messages are encrypted and securely stored using dynamic security keys, no message manipulation is possible. Any attempted modification of an encrypted Email message renders it unreadable since modification would result in a decrypted message of gibberish. With MyMail, the Email message sent is the Email message received.