I am a little confused by the need for 'foolproof'. Do you mean they cannot type it in wrong? Or they might send you junk mail? Or are you worried the email will address will be abandoned? As in we are leaving school, and we always want to keep in touch?
We have all had the experience of an important email going to spam and being missed, with no visibility to the sender. I want to be sure I'm actually getting my messages, especially messages from people contacting me for the first time.
I plan to set one up soon as I am hoping to go digital nomad in the next year or so and do not want to be tied down, but still want a fixed address, that is not my brothers house.