Computers and Technology

The application layer process that sends mail uses . When a client sends email, the client process connects with a server process on well-known port . A client retrieves email, however, using one of two application layer protocols: or . With , mail is downloaded from the server to the client and then deleted on the server. The server starts the service by passively listening on TCP port for client connection requests. However, when a client connects to ta server running , copies of the messages are downloaded to the client applications. The original messages are kept on the server until they are manually deleted.

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