The invention relates to a technology for conducting security monitoring and control auditing on intranet mails, in particular to an embedded type mail security monitoring and control method based on an intranet new mail platform. According to the method, a star structure allowing foundation nodes to be connected to a central node is set up on the basis of an electric power intranet mail system, it is ensured that each foundation node is in communication with the central node while every two foundation nodes are in communication with each other, and therefore connection file configuration is simplified, postal route expenses are reduced, meanwhile, it is ensured that mails must pass through the central node, the mails can be conveniently and safely traced and positioned, and the improvement of application combination property of the mail platform is promoted. The centralized type and foundation node distributed type combined intensive deployment is achieved on the basis of the central node of the electric power intranet main system, the foundation nodes are used for refining and specializing security detailed rules and regulations in a central node frame, and therefore safe and whole-journey trace management of the mails of units located in the governed area is achieved, and finally safe and level-to-level management of the mails is achieved.