The invention discloses an E-mail
encryption method which comprises the steps that mail information sent by a terminal is acquired, and the mail information comprises a
receiver, an object, a text and an attachment; whether an
encryption password is comprised in the mail information is judged, when the judgment is confirmed, an E-mail is encrypted according to the mail information, the encrypted E-mail comprises a mail head, a template text, an encrypted text and an encrypted attachment, and the mail head further comprises
encryption identification corresponding to the E-mail. The invention further discloses a mail
server and an E-mail
encryption system. By adoption of the E-mail encryption method, the mail
server and the E-mail
encryption system, a standard format of an E-mail is expanded, each E-mail can have an independent encryption
password, and safety of E-mail data is greatly improved. Simultaneously, because the whole encryption data are placed in an original text of an E-mail, the E-mail can be independently downloaded and decrypted. In addition, the E-mail is encrypted by utilizing an Rijndael encryption method, and entity data of each E-mail are effectively ensured.