Peter: > On 24/11/20 3:56 am, Wietse Venema wrote: > > Jaroslaw Rafa: > >> Dnia 23.11.2020 o godz. 10:18:39 D'Arcy Cain pisze: > >>> > >>> I used to have a client who was not getting emails from one of his > >>> friends. Turned out that the friend's client/MUA was not adding the > >>> message ID. > >> > >> Doesn't Postfix automatically add Message-Id: header upon sending a message > >> if none is present? > > > > For the last 17 years, Message-ID is added to "local" email only. > > > > http://www.postfix.org/postconf.5.html#always_add_missing_headers > > Might want to clarify that in cleanup(8): > > The cleanup(8) daemon always performs the following transformations: > > ? Insert missing message headers: (Resent-) From:, To:, > Message-Id:, and Date:. > > ...the explicit use of the word "always" there is misleading.
Thanks for the pointer. I am updating ths manpage. Wietse