RFC 6857, "Post-Delivery Message Downgrading for Internationalized Email Messages", March 2013

Errata ID: 6573
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Kaspar Etter
Date Reported: 2021-05-05

Section A says:

   From: =?UTF-8?Q?DISPLAY-LOCAL?=
         =?UTF-8?Q?NON-ASCII-LOCAL=40example=2Ecom?= :;

It should say:

   From: =?UTF-8?Q?DISPLAY-LOCAL_?=
         =?UTF-8?Q?NON-ASCII-LOCAL=40example=2Ecom?= :;

Notes:

Taking the original text from Errata 3955 (https://www.rfc-editor.org/errata/eid3955), the two encoded-words decode to: DISPLAY-LOCALNON-ASCII-LOCAL@example.com :; (According to section 6.2 of RFC 2047, linear whitespace between adjacent encoded-words is ignored.) This is clearly not desirable and thus a space should be encoded at the end of all display names in appendix A.

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