Unverified60% confidenceFactExact time
Email sending uses the SMTP protocol, while receiving uses IMAP or the older POP3 protocol.
2
Sources
60%
Confidence
Long-term
Relevance
8/4/2026
First Seen
Sources
苹果Mail发送非iCloud邮件时为何连接iCloud服务器？原因解析
Related Claims
VerifiedThe SMTP protocol was born in 1982 and is responsible for the sending and relay transmission of emails.74% 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72% 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.70% similarVerifiedModern email is built on the SMTP protocol, whose core architecture has undergone almost no fundamental changes since the publication of RFC 821 in 1982.67% similarUnverified原生SMTP底层灵活但缺乏可靠的入站邮件接收机制65% similar
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