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/ jhar...@impsec.org FALaholic #11174 pgpk -a jhar...@impsec.org key: 0xB8732E79 -- 2D8C 34F4 6411 F507 136C AF76 D822 E6E6 B873 2E79 ----------------------------------------------------------------------- 610 days since the first commercial re-flight of an orbital booster (SpaceX)