Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (email) transmission.
Although electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically use SMTP only for sending messages to a mail server for relaying. For retrieving messages, client applications usually use either IMAP or POP3.
SMTP communication between mail servers uses TCP port 25. Mail clients on the other hand, often submit the outgoing emails to a mail server on port 587. Despite being deprecated, email providers sometimes still permit the use of nonstandard port 465 for this purpose.
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