Does the Microsoft Mail App add a Message-ID Email Header

EK 1 Reputation point
2022-08-25T08:43:49.193+00:00

When sending emails from the Microsoft Mail App (Win10Pro,21H2) to gmail-recipients, these emails are not accepted since a few weeks, as it seems that this Mail App does not add a Message-ID in the email header which the gmail-side seems to require.
( I checked this in my Webclient , where I can see the full header).

Reading some other Q&A here, I see that Outlook add this Message-ID.

I allready tried deinstalling/installing the Mail-App, and updating Windows completely, but still the Mail-App does not add the Message-ID.

Is there any way to set up the Mail App in such a way as to add a Message-ID?

Thank you very much in advance.

Kind regards
EK

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  1. Andy David - MVP 143.8K Reputation points MVP
    2022-08-27T14:51:39.257+00:00

    There is no requirement that mail servers or clients add a message-id , although they should. If Gmail rejects these, there isnt much you can do other than to not use the Windows Mail client if its not doing the right thing.

    1 person found this answer helpful.
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  2. BlueTie 5 Reputation points
    2023-01-19T12:49:33.26+00:00

    To eliminate the error/rejection from Google you are getting, make sure your domain is authenticated by adding a valid SPF record on your domain. If you are not authenticated, GMail will scrutenize your email. The originating application should add a message-id, but it isn't required. Google will add one, but without being authenticating, will usually opt to reject your email instead.

    1 person found this answer helpful.