On 2026-08-23 18:39:55 +0200, Alejandro Colomar via Mutt-dev wrote:
> > Is there any standards-based support for it?
> 
> There's no support nor restriction from standards.

RFC 2076:

   In e-mail: reference to other        References:    RFC 822: 4.6.3
   related messages, in Usenet News:                   RFC 1036: 2.1.5.
   reference to replied-to-articles.

RFC 822:

     4.6.3.  REFERENCES

             The contents of this field identify other  correspondence
        which  this message references.  Note that if message identif-
        iers are used, they must use the msg-id specification format.

but this has been dropped later and is not present in RFC 5322, which
just describes it in the reply case.

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Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)

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