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Date: 7 Sep 2018 11:21:00 +0200
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From: "John Levine" <johnl@iecc.com>
To: freebsd-questions@freebsd.org
Cc: wfdudley@gmail.com
Subject: Re: DKIM is driving me nuts
In-Reply-To: <CAFsnNZ+qeK+M1PPFns59wDeH_Y+-3VDmkwN-iZAEU7qcHS8oRA@mail.gmail.com>
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In article <CAFsnNZ+qeK+M1PPFns59wDeH_Y+-3VDmkwN-iZAEU7qcHS8oRA@mail.gmail.com> you write:
>Something is different between using Mail/mailx and using Thunderbird,
>and I've given up trying to figure out what.

Thunderbird includes all the required headers, mailx doesn't so
sendmail has to add some, probably date and message-id.

Please see my previous message which told you how to fix it.

R's,
John

PS: I have to agree with other people, if this is too hard to figure out,
it's time to give up and pay someone else to manage your mail.