SMTP
SMTP
简单邮件传输协议
SMTP · SMTP · 简单邮件传输协议 · ess-em-tee-PEE · Simple Mail Transfer Protocol · Email · email · protocol · sendEmailSimple Mail Transfer Protocol/ess-em-tee-PEE/
Also known as: Simple Mail Transfer Protocol
Last updated August 7, 2026
Definition
SMTP (Simple Mail Transfer Protocol) is the standard protocol servers use to send and relay email between mail systems across the internet.
Real-World Example
When you hit Send, your mail app hands the message to a server that uses SMTP to deliver it toward the recipient’s provider.
References
Related terms
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