I think that is a proposal - not a standard. And even if I am incorrect, the MUAs are the ones that need to be fixed.
I just searched through all RFC's and not one has 'mail-followup-to' (any or mixed case variation) in it.
The only draft (draft-palme-mailext-headers-08.tx) that has that string specifically says it is non-standard.
Doug Royer <Doug@xxxxxxxxx> wrote:
Some do not like the REPLY-TO set, other like me feel then need it set.
Adding some kind of "if it is for the list - reply to this emai address"
or if it is for the person use this reply-to address. This may be more of
a MUA than protocol issue. But it is a topic I have seen on several lists.
There's a standard for this; it's called Mail-Followup-To:. See http://cr.yp.to/proto/replyto.html and a bunch of other pages I don't have time to dig up right now.
Charles
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