It works now.
Here is what I did. In that order (even though I had performed each step already several times today)
Deleted ALL old newsletters.
set time 10 minutes to the future
ticked publish!!! (even though you said I shouldn't)
deleted cron job on joobi site
created new crob job
Newsletters are being sent.
I have never before had so much trouble with payed software like with joobi stuff. Even though functionality is good, its "sloppy" nothing is really reliable. There is always stuff happening. Never before did I have to give ftp access and backend access so many times to a company.
It would be ok, but your stuff is REALLY expensive.
I expect more.
Count on it, first opportunity I see another component that has the functionality and I will jump ship.