What is the workaround. How is this solved. I am on Version 8 too.
I tried Safari and then Chrome too.
In both cases the email setup hangs when i try to create an Email Domain. It says ‘Saving’ and the whole browser is greyed out as though nothing is happening.
Using the VM install i found this same issue too. I found using the ip address instead of the hostname of the mail server worked for me. This indicates there may be an issue with dns resolution in the vm and Frappe but it may at least get you up and running