HI Rick,
I have not responded to everyone who took the time to post their problems & frustrations with the lack of solutions.
So for everyone is following this forum, I want to thank them.
This solution seems the most logical but an update should just work if all the requirements are met. I haven't even updated my new iMac to Sierra because I don't want to deal with another set of issues. When I have a chance, I will take my iPad to a local place to do this for me. I did update both iPhones, 5c & 6s, but have not used them with the Mail app.
I'm so sorry that you had to spend so much time but at least we all have a solution so your efforts are not unappreciated. No thanks to the Apple experts. Thanks so much for posting, vtsue