On Mon, May 19, 2025 at 02:23:20PM -0700, Will Yardley wrote: > On Sun, May 18, 2025 at 11:42:08PM -0400, Kurt Hackenberg wrote: > > Mutt needs to know what addresses are mailing lists to generate the > > header Mail-Followup-To:, which asks recipients not to send duplicate > > messages to you. > > As best I understand, M-F-T is a draft from 1997 that expired in > 1998(?), never made progress towards becoming a standard (and is only > implemented by a handful of other clients other than Mutt, none of which > are super widely used / mainstream). This was true even ~ 20 years ago > (just found an old thread from this list about the landscape then), and > I don't think really much has shifted since.
I remember that thread, in fact I looked at it when this topic resurfaced. And I remember being excoriated for saying that I used it occasionally when filing messages to my own mailbox. (OK it was a little more complicated than that.) -mm- PS: I still do, on a few selected lists. This is the relevant line from my hdrctls file: list-id:mutt-users.mutt.org::sieve { \ if not exists "Mail-Followup-To" { \ addheader "Mail-Followup-To" "mutt-users@mutt.org"; } \ keep; } hdrctls has a lot of definitions for elements found in an incoming email message. (One of the fields, here blank, can have a priority that is consulted if there are multiple matches.) When the message is filed based on a hdrctls entry, a header field is added saying which one was used, e.g. this is the one in the message I'm replying to: X-HDRCTLS-KEY: list-id:mutt-users.mutt.org But I do go on. Let the further excoriation begin. (he kids.) Perhaps about the use of "X-"