FWIW, I agree with Arash's sentiment. This, again, goes back to the
notion that a message without a Message-ID is (more or less) invalid.
Therefore any and all e-mail software (user agents and transport agents
alike) is disciplined to add a Message-ID to any message without one, to
avoid transferring invalid messages.
It boils down to Postel's principle: "Be liberal in what you accept, and
consevative in what you send!". ;-)
Cheers,
/Liman
rameik...@posteo.net writes:
>> Well, how else do you explain that when I remove Message-ID from
>> message-required-mail-headers and send my email, then the Message-ID
>> is given by the value of message-user-fqdn or when nil, by
>> system-name?
ar...@gnu.org 2023-12-11 07:35 [+0100]:
> As I already said: My guess was that your sendmail program adds a
> message-id. You can set `message-generate-headers-first' to t and see
> what headers Message produces when you start editing a message, maybe
> that gives you a clue. Besides that, I have no other idea.
> Best, Arash
