Hi @lpb 
We usually don’t recommend “passing over email address” it is tedious to manage account changes, but from my time in the support team and my experience in the Forum, it is a courant practice (mostly in non-profit). Our guide article on removing an email address from your account mentions it too (“If you have an email address associated with your account that you no longer use or that belongs to someone else, you can remove it.”).
That’s another solution indeed!