@tkd Sorry. forgot to give the workaround. I have given explanation of the workaround below. Workaround: Add a Domain called demo.mydomain.com in the Cloudron Domains view. This can have the same DNS settings as mydomain.com. Now go to Email view and enable masquerading for demo.mydomain.com. Then change the domain of your existing app installed at demo.mydomain.com i.e in configure UI -> Location and then in the drop down select demo.mydomain.com and leave the location field empty. Effectively, the app remains at demo.mydomain.com but is using the settings of the Cloudron's demo.mydomain.com Explanation: On Cloudron, we don't allow apps to send email with arbitrary addresses across domains. So, if an app has to send emails as demo.mydomain.com then it has to be installed under that domain. Side effect: Now your invite emails will also go from demo.app@demo.mydomain.com. Hope this is OK. BTW, you can change this "demo.app" in the Email section of the app's configure UI.

Awesome, many thanks for your quick work on this.

As an update, I found this post solved the issue https://forum.cloudron.io/topic/1819/wordpress-unmanaged-re-directions-unable-to-install/4 I have example.com for the primary domain & my.example.com for Cloudron admin. For the Ghost app, it is ghostexample.com. At first visit, it showed me the Cloudron login page. This was fixed after a while. The www.ghostexample.com going to admin page was fixed by removing CNAME & adding redirect. Thanks for the support!

I have pushed a fix for Ghost now.

Late responding but thanks so much for the fix @girish !