Some old mails show up again, with a different date
I have an email from late 2018 that showed up again at new mail in the Mail app. It's dated from today, but looking at the headers, you can see it's an older mail from Dec 2018.
Checked with other mail clients and mail provider webmail, the mail doesn't show up.
Initial email date:
- Dec 11 2018
Dates it shew up again:
- March 29 2019
- June 5th 2019