Unfortunately, no solution yet. Only a workaround. I downgraded my machine to windows 8.1, configured my accounts correctly in the mail app and then when I upgraded to windows 10, the accounts were...

I'm not familiar with this strategy... How does it work? username@email@address.com ?

Thank you!

Thank you for the suggestions!
Yes, I've tried different strategies.
The most successful was not to put my username (not the address) for the server sign on. I was able to connect, receive...

Yes, thank you.

That's the option I've been using.
It had two separate fields for username and email a couple of builds ago and now it doesn't.

Same here. I have an email account from my University and username and email address aren't the same.
I can't set it up anymore...