I wanted to email someone whose email I couldn't remember (and I guess isn't getting pulled in from Nextcloud because I've taken that offline due to the PHP thing), so I searched my inbox for the most recent email from that person, then hit reply.

But I also changed the subject (because it was about something new), and deleted the email thread chain from the new email. And hit send.

But now the message that I sent is appearing in my inbox and it looks like it comes from who I sent it to! Odd. I think caused by what I did. But again, I think that is a common user story and so likely needs addressing