RFC 5322, "Internet Message Format", October 2008Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app
Errata ID: 4692
Status: Held for Document Update
Reported By: Oleg Andriyanov
Date Reported: 2016-05-13
Held for Document Update by: Barry Leiba
Date Held: 2019-04-30
Section 3.2.4 says:
qtext = %d33 / ; Printable US-ASCII %d35-91 / ; characters not including %d93-126 / ; "\" or the quote character obs-qtext
It should say:
qtext = %d32 / ; Printable US-ASCII %d33 / ; characters not including %d35-91 / ; "\" or the quote character %d93-126 / obs-qtext
According to the Open Group's definition of the "print" class of characters in a locale , the SPACE character (%d32) is printable as well. So either it should be included in the "qtext" definition or the comment should state explicitly that it is excluded from "qtext" along with backslash and double quote.
----- Verifier notes -----
There are many places in the document that refer to "printable US-ASCII characters", and it's clear from the context of them that SPACE was not included there. This issue does need to be looked at when we revise this document to advance it to Internet Standard.