Cannot report a bug, iPad store version. Was asked which instance I'm on with login and password, so 100% fail. Basically this app does not know what federation is. Sad, it was a great app.
Linux on my selfhosted system with email and DNS, FreeBSD on my 2nd system. 2ndary DNS and hot standby for emails. Best of both worlds. You may hack the primary, but not both.
Just a young account.