On Mon, December 13, 2021 1:14 pm, Fred Bone wrote: > On 13 December 2021 at 8:36, Chris Green said: > >> Yes, of course, if someone's mail client doesn't put the Message-ID: >> there then there's not much one can do. My mail client will thread >> using the Subject: if required but it's far from the 'right' way to do >> it. > > Message-ID: is one of the few required headers. If the MUA fails to > supply it then the first MTA should do so. > > Threading relies on the In-Reply-To: which is supposed to contain the > contents of Message-ID: from the message being replied to. If the MUA > fails to create it then nothing else can.
The mailer I use on my phone (Aquamail) does not insert an In-Reply-To header. It's my #1 complaint of an otherwise amazing app. So yes, there are MUAs out there that don't insert that header. :( > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. -derek -- Derek Atkins 617-623-3745 de...@ihtfp.com www.ihtfp.com Computer and Internet Security Consultant _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user If you are using Nabble or Gmane, please see https://wiki.gnucash.org/wiki/Mailing_Lists for more information. ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All.