Message IDs and reply threads
05Each new message has its own ID; reply fields describe relationships to earlier messages.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 3.6.4 ↗
RFC 5322 · § 3.6.4EXAMPLE
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03
Extend the chain.
References retains the ancestry described by the RFC.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
A reply gets a new identifier.
- Message-ID should be present and must be globally unique when used.
- In-Reply-To names parents; References describes the reference chain.
A matching subject is not a unique thread identifier, and IDs do not authenticate senders.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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