7On Wed, 11 Feb 2026, Ángel via mailop wrote:
There is an implicit requisite that Message-id are not
predictable. But a system where Message-ids could be guessed would
be vulnerable to malicious emails getting into existing threads, so
it should already be that way (and what everyone? is doing), so this
doesn't impose any extra work.
Exim Message-ids are in one of a few standard forms
(Exim version and machine type determine which)
that have no actively random parts, just date, time,
process id and optionally a local server id
(so that you know which of your machines generated it).
Does that count as "not predictable" or "guessable" ?
--
Andrew C. Aitchison Kendal, UK
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