I flip-flopped that setting, but am sending this from Outlook 2016 and have made sure that the checkbox for e-mail posting is checked and changed the signature text for good measure.
I am cutting the text from your prior message just so we have as little as possible showing up ahead of the signature (or lack thereof).
Let’s see what shows up.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
The specialist knows more and more about less and less and finally knows everything about nothing.
~ Konrad Lorenz (1903-1989)