Introduction - If you have any usage issues, please Google them yourself
This process can check pop3 e-mail messages, pure Winsock and Win32 API, not MFC and Winsock2. Used to use the API function CreateThread, GetOpenFileName, trayicons, SetTimer, sndPlaySound, GetExitCodeThread, TerminateThread and so on. Information communication security features include 1. Authentication, so that the recipient is convinced that the sender is that he or she is the public key corresponding to that person 2. Confidentiality, to ensure that only the desired recipient can read the e-mail 3. The integrity of to ensure that the information during transmission is not altered 4. to confirm the news arrived, the author confirmed that the recipient received the message