Verified75% confidenceFactExact time
The SMTP protocol was born in 1982 and is responsible for the sending and relay transmission of emails.
5
Sources
75%
Confidence
Long-term
Relevance
7/14/2026
First Seen
Sources
MailFlow开源邮件客户端：开发者参与指南与价值解析
Related Claims
VerifiedModern email is built on the SMTP protocol, whose core architecture has undergone almost no fundamental changes since the publication of RFC 821 in 1982.82% similarVerifiedSMTP was born in 1982 (RFC 821); the modern version is ESMTP (RFC 5321), and a single session consists of four phases: handshake, authentication, envelope declaration, and data transmission.81% similarUnverifiedEmail sending uses the SMTP protocol, while receiving uses IMAP or the older POP3 protocol.74% similarUnverifiedSMTP 协议在设计之初（RFC 821，1982年，由 Jon Postel 撰写）没有考虑身份验证问题，任何人都可以声称自己是任何发件人72% similarUnverifiedSMTP协议存在致命缺陷：任何人都可以在邮件的发件人字段填写任意地址71% similar
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