On 16.01.21 07:42, Ron Garret wrote:
> Because not every email has one.  RFC5322 doesn’t require them.
> 
> On Jan 15, 2021, at 6:30 PM, @lbutlr <[email protected]> wrote:
>> Why not simply use the message-id?

(Also, you can legally have several e-mails with the same Message-ID in
your mailbox; e.g., someone addressed it to two aliases that both expand
to you, just to name one possibilty where *both* go through *sieve* as
well.)

Regards,
-- 
Jochen Bern
Systemingenieur

Binect GmbH

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