Re: Have message-ID set by my email server rather than by Message

["Otto J. Makela" <om@iki.fi>]

On 12/11/23 11:01, Lars-Johan Liman wrote:
> 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.
A quite normal arrangement is to have separate MTA (message transfer agent,
for internet-incoming email) and MSA (message submission agent, for your
local email clients) services.

MSA's (which typically require user authentication) often don't enforce
message rules as strictly as MTA's which have to contend with incoming spam,
and thus can add in missing Date, Message-ID etc fields.

https://en.wikipedia.org/wiki/Message_submission_agent

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