My first post, setup everything first go including letsencrypt. My only issue seems to be with Public folders or Other users inbox and only with iPhone mail. I use quite a few individual email addresses for receive only so the public folders suit perfectly and do not require additional licencing.
On the iPhone when a Public folder is selected the emails list perfectly with the two preview lines. When opened the contents of any email is blank. If I forward that email the contents will be displayed. Sub folders of the main address work properly.
Security works properly on non iPhone mail clients and the contenet is available and renders properly when forwarded or replied to.
Any ideas, just a pain to view contents.