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Status: Reported (1)

RFC 9057, "Email Author Header Field", June 2021

Errata ID: 8556
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Fraser Tweedale
Date Reported: 2025-08-27

Section 3 says:

author = "Author:" mailbox-list CRLF

It should say:

author = "Author:" (mailbox-list / address-list) CRLF

Notes:

RFC 6854 updates RFC 5322, relaxing the syntax of the From: header field to admit group syntax.
The definition in this RFC 9057 is based on the earlier syntax from RFC 5322. The processing rules
also specified by this RFC require that the value of the Author: field when created MUST BE identical
the the value of the From: field. This condition cannot be satisfied in general, because the From:
field (per RFC 6854) admits values that the Author: field does not admit.

This RFC should be updated to follow the RFC 6854 syntax and include RFC 6854 in the normative references.

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