On 2026-02-16, Nuno Silva wrote: > On 2026-02-16, raf via Mutt-users wrote: > >> On Mon, Feb 16, 2026 at 08:28:44AM +0100, Nicola Pinna >> <[email protected]> wrote: >> >>> <On Sat, Feb 14, 2026 at 06:15:26PM +0000, Nuno Silva via Mutt-users wrote:> >>> >>> > On 2026-02-09, Matthias Apitz wrote: >>> > >>> > > I'm adding to all my mails sent with mutt (like this one) two X-header >>> > > lines: >>> > > >>> > > X-Operating-System: FreeBSD 14.0-CURRENT r1400094 (amd64) >>> > > X-message-flag: Mails in HTML will not be read! Please, only plain >>> > > text. > [...] >> I expect that it's unlikely that recipients of your >> emails would see the X-message-flag header. I might be >> wrong, but many non-mutt mail clients I see don't show >> many headers at all (not even the From: header!). You >> have to out of your way to see them. > > As has been stated a few times: recipients using at least some Microsoft > MUAs *will* see the content of that header in the user interface. > > It's not shown as a header, it's shown as a sort of label on the > message.
Oh, actually, on further testing, it seems I confused the Subject and flag contents when checking, and what's shown above the message is the *Subject* (I should probably have used more distinct strings when testing!). So it seems current OWA can't show the content of this header a Microsoft clients did in the past? (I don't really use the webmail that often, so I didn't realize that the subject is usually displayed that way now; most of my experience with Microsoft's webmail was back in the times of the yellowish one (the one before the current blue envelope version?). I wish the earlier, lighter one (possibly the last one more actively branded as OWA?) was still available (used to be until somewhat recently (either half a year ago or 1.5 years ago, when they discontinued it; up until then, you could get it by identifying as IE6)).) -- Nuno Silva
