Warning when HTML and Plain Text in email doesn't match
I recently ran into a problem where recipients were clicking on links that were not present anywhere in my HTML email and not relevant at all to the content. The email was cloned from a different email and changed completely. I was unaware that the Plain Text version retained the original content of the cloned email even though I changed the content on the HTML version. So when this email was sent, those viewing it in Plain Text saw something completely different than intended. Even though it's easy to fix by resetting the Plain Text version to match the HTML, I strongly feel there should be a warning displayed that the Plain Text and HTML content do not match before sending.