As I understand it, an email message was prepared manually, and was given later to an email software. I'm guessing it was done to prepare multiple similar messages, maybe with a script. The message was legitimate, email sender and signer were the same person. The difference was 1.5 hours, so just a bit more than our threshold of 1 hour.
Bug 1863705 Comment 5 Edit History
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As I understand it, an email message was prepared manually, and was given later to an email software. I'm guessing it was done to prepare multiple similar messages, maybe with a script. The message seemed legitimate to me, email sender and signer were the same person. The difference was 1.5 hours, so just slightly above the threshold of 1 hour that Thunderbird currently tolerates.