Simple Mail Transfer Protocol Port Number. Smtp is an application layer protocol. The most commonly used protocols are pop3 and imap.
As soon as it listens for a tcp connection from any client the smtp process initiates a connection through port 25. Characteristics of smtp smtp is a push protocol. Described in rfc 5321.
2525 587 466 2526 contents show simple mail transfer protocol.
Characteristics of smtp smtp is a push protocol. As soon as it listens for a tcp connection from any client the smtp process initiates a connection through port 25. Smtp is a connection oriented protocol. Smtp uses transmission control protocol and runs on port number 25.