My wordpress settings email is email@example.com. When I search my entire database for the email of firstname.lastname@example.org, it does not exist.
Yet my registration emails are still sent from email@example.com for some reason.
The only thing I can think of is that when I look in my wp_users table, I have no user with the ID of 1. I believe this is the default admin ID. I'm not sure who did it or when, but I think the default admin was deleted a long time ago and I just made my username admin. Perhaps if wordpress doesn't find an admin email, it automatically goes to wordpress@?
I'm confused with this one.