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讨论了在企业内部网中电子邮件系统的安全问题。采用对称密码算法对传输的信件进行加密，而加密该信件的对称密钥是用RSA算法加密的。根据MIME协议在收发两端对本次通信的密钥、签名与密文分别进行打包、识别与处理。利用公钥服务器来对公钥进行管理与维护。以此构成了企业内部电子邮件系统的安全体系。
Discussed the security of e-mail systems in intranets. The symmetric cipher algorithm is used to encrypt the transmitted message, and the symmetric key to encrypt the message is encrypted using the RSA algorithm. According to the MIME protocol, the key, signature and ciphertext of the communication are packaged, identified and processed respectively at the two ends of the sending and the receiving. Use the public key server to manage and maintain the public key. This constitutes a system of internal e-mail system security.