Unverified50% confidenceFactExact time
RFC 5321是IETF制定的SMTP标准，规定邮箱地址local-part的解释权归属于接收方邮件服务器
1
Sources
50%
Confidence
Long-term
Relevance
8/20/2026
First Seen
Sources
Gmail点号忽略机制为何导致邮件误送给同名用户
Related Claims
UnverifiedUnder the RFC 5321 email standard, the local-part of a mailbox address is theoretically case-sensitive and every character is significant, including dots.69% similarUnverified令牌自省端点（/introspect，RFC 7662）允许资源服务器向授权服务器发送 POST 请求，获取包含 active、scope、exp、sub 等元数据的 JSON 响应67% 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67% similarVerifiedModern email is built on the SMTP protocol, whose core architecture has undergone almost no fundamental changes since the publication of RFC 821 in 1982.66% similarUnverifiedIn the standard SMTP process, when an email is sent to a non-existent address, the receiving server returns a 5xx error code (such as 550 User Unknown) and the sender receives an NDR bounce notification.66% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/778695API
curl https://kongchang.com/api/v1/knowledge/claims/778695MCP
get_claim(id=778695)