I'm working to solve an issue where my Controller Class sends an email. I set the ReplyTo and I set the SenderDisplayName those are both correct however. The email visually displays another users email that is no longer at the company. I can't understand or trace how this is being set. When I look at the mail details I see that the return path shows the old users email. We are not using Org Wide Defaults. How else could this from email address be set?