On Fri, 30 Nov 2018, Rupert Gallagher wrote:

Although the RFC allows muas not to include the mid, the same RFC does not mandate mtas to accept them. Since 100% of such emails on our records are spam, then we reject them upfront.

...and if you're adopting that policy, the configure your MTA to reject messages missing a Message-ID during the SMTP phase before it ever touches SA.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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