Short for Simple Mail Transfer Protocol, SMTP is an Internet standard for the sending of e-mail messages over port 25. While it is mostly used for transfer from one mail server to another, some client mail applications use SMTP for relaying messages; whereas receiving happens via POP or IMAP.

Computer acronyms, E-mail, E-mail terms, Network terms, Protocol, X.400

If you are looking for your SMTP address or SMTP server, this information is only obtainable from your ISP or e-mail provider.

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