Updated: 10/17/2017 by Computer Hope

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.


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

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