bug#64454: 30.0.50; In-Reply-To header obsolete content

[Björn Bidar]

Robert Pluim <rpluim@gmail.com> writes:

>>>>>> On Tue, 04 Jul 2023 14:11:35 +0800, Andrew Cohen <acohen@ust.hk> said:
>
>     Andrew> When replying to an email, gnus constructs an In-Reply-To: header 
> that
>     Andrew> contains the message-id of the originating email followed by a 
> phrase of
>     Andrew> the form:
>
>     Andrew> (User's  message of "Wed, 17 Nov 2021 22:16:04 -0800")
>
>     Andrew> While allowed, the addition of this parenthetical phrase has been 
> made
>     Andrew> obsolete as of RFC5322. I suggest removing it, or wrapping it in a
>     Andrew> defcustom 'message-strict-rfc5322. Any preferences?
>
> Iʼd remove it, document its removal, but have a defcustom to get it
> back.
>
> Robert

Could it still be relevant when interacting with clients that confirm to
that rfc?