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RFC 8617, "The Authenticated Received Chain (ARC) Protocol", July 2019

Source of RFC: dmarc (art)

Errata ID: 8357
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Robert Sayre
Date Reported: 2025-03-30

Section 5.2.2 says: 

5.2.2.  Responding to ARC Validation Failures during the SMTP
        Transaction

   If an ARC Validator determines that the incoming message fails ARC
   validation, the Validator MAY signal the breakage through the
   extended SMTP response code 5.7.29 ("ARC validation failure") and the
   corresponding SMTP basic response code.

It should say:

The text is fine, but an SMTP RFC is not cited.

Notes:

Cite RFC 5321 or a replacement.

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