Strange "Reply to:" address appearing on sent emails
Recently, a couple of my sent emails have "Reply to:" followed by a very long email address that has nothing to do with me under the name of the sender. It only appears on some emails, and I see it when I go back and look at them in my sent file. When I exit the sent folder and then go back to look at the email again, the "Reply to:" line has disappeared. The end of this strange email address includes the name of a website I get emails from daily, but with "e." after the @ and before the company name. My software is up to date. What is this, and how can I get it to go away? Thanks.
iPhone 12 Pro Max