Thank you Nick,
I now have it running in the way that I want it...Just for reference this is what I added:


I know some of it is overkill, but very happy that it works.
There is a small error in the description that you reference SMTP Authentication to ISP
It says:
In chapter starttls it says:
The ISP's mail server, username, and password are kept in a separate file: /etc/postfix/sasl_passwd. The format is:

But in the described case this should be:


After I changed that it all started to fall in place!