On 15 Jan 2021, at 23:42, Ron Garret <[email protected]> wrote:
> Because not every email has one.  RFC5322 doesn’t require them.

And yet, I can tell you exactly how many messages on my mail server do not have 
a message-ID.

Zero.

-- 
'I'm a raven, aren't I?' it said. 'One of the few birds who speak.
        The first thing people say is, oh, you're a raven, go on, say the
        N word... If I had a penny for every time that's happened, I'd-'

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