Hello Ivo!
Three times now, when I build a new websites and install Headlines Quickstart (Joomla 3.8) and then I update Gantry and update Joomla I then update AcyMailng and then try to get a look at the new site homepage I get this error message:
This redirect url is not allowed, you should change the "Allowed domains for the redirection via the module" parameter from the AcyMailing configuration page to "localhost|conservatives.tech" to allow it or set it to "all" to allow all urls
Please advise