The imap settings seem right. I’ve even tried the all the possible wrong settings. This issue happens on 2 different MIAB installations and with multiple Samsung Galaxy Note 5’s.
[Solved] turns out to be an issue that the standard email app for Android phones does not have stattls as an option and/or some other issue like that.
I downloaded bluemail from the app store and it works like a charm. It is great!!! After setting up 2 email accounts, it auto detects the rest of the accounts. Takes a little getting used to for navigating around the app but I am already more than happy.