It's in the envelope sender, which your mail system probably doesn't
preserve when it stores mail. Traditional mbox format has it in the 'From '
line.
Cheers,
Hans-Martin
Am 18. August 2020 20:03:46 schrieb Carl Byington via mailop
<mailop@mailop.org>:
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On Tue, 2020-08-18 at 15:23 +0300, Atro Tossavainen via mailop wrote:
The SendGrid account sending these yesterday is 13999362.
Where do you find that account number in the headers? I see some from
today with "Upgrade (FINAL WARNING)" in the subject, but no indication
of any sendgrid account number.
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