A "mooving frame" where blocks move to let help text appear, then stay larger than other blocks with the text until the user touches another "choice" seems rather complex. Large button "next" is too large and does not help in making the process self explanatory.
The current flow is simpler: the user sees everything in a static menu, and presses "OK" to go to next step. Isn't possible to just redraw the current screen, without changing the selection behavior? As an improvement, I would recommend to use less text ("Kerio is not supported" seems confusing to me and probably to more than 80% of users)
Please take a look at other email apps accout creation process (I suggest TypeApp): I have just checked it and it is simpler and clearer IMO.
Technically the selection behavior is the same - its just that you don't tap on a radio button, but on a material card. You still make a selection and press a confirmation button, same amount of steps.
The benefits I see are cleaner UI with larger text + large icons, no radio buttons. No 'wall of text' effect as we show the help text bits only where you tap (generally, users
hate reading). Please keep in mind that the expected behavior for most people is to just tap on one of the options and then tap Next.
(my assumption is that most people who know about email clients also would kind-of know they have a Gmail account or an Outlook account, etc).
Thanks for your feedback.