Authors, senders, and recipients
04From describes authorship, Sender the transmitting agent, and Reply-To reply destinations.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 3.6.2 ↗
RFC 5322 · § 3.6.2EXAMPLE
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03
Choose reply and visibility.
Reply-To can direct replies elsewhere; Bcc must protect blind-recipient details.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
RFC 5322 § 3.6.2RFC 6854 § 2.1
The later update permits group syntax in originator fields under specified conditions, while recommending against its general use. This does not authenticate authorship.
Read the updated RFC section ↗These roles are not identity proofs.
- Multiple authors in From require Sender under the base specification.
- Bcc handling must avoid exposing blind recipients to other recipients.
The SMTP envelope can differ from the displayed recipient fields.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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