SMTP Definition (Simple Mail Transfer Protocol)

December 5, 2022

The Simple Mail Transfer Protocol (SMTP) is a TCP/IP protocol that allows devices to send and receive e-mail.

Compared to other mail transfer protocols, such as POP or IMAP, SMTP is the only protocol that supports sending e-mails from one unknown server to another. However, due to SMTP’s limited ability to queue messages on the receiving end, it is typically used in combination with POP or IMAP.

Anastazija is an experienced content writer with knowledge and passion for cloud computing, information technology, and online security. At phoenixNAP, she focuses on answering burning questions about ensuring data robustness and security for all participants in the digital landscape.