My view is that not having a Message-Id in your +outbox messages is a
lot more broken than having a sub-optimal Message-Id. The chance of it
being broken (being non-unique) is non-zero, but damn near. So,
"breaking existing user's setups" is a bit strong.
You know, maybe I'm crazy ... but now that I think about it, I don't
have any Message-Ids in any of my outbox messages ... and I don't
care. Like, at all. I've simply never needed it. So ... what's the
big deal? Am I missing something amazingly obvious that having a
Message-Id on outbox messages gets me?
Ralph Corderoy said that he hates fcc because by default it doesn't
include a Message-Id, and without it he cannot refer someone to an
earler email. I guess I don't understand his point ... how does having
a Message-Id help you there?
(I am neutral on changing the default, BTW ... I just want to understand
what I'm missing).
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