If I were Nicola, I'd set up the email address "permission at mame dot whatever" and then set up an auto-responder that sent out the same reply to everyone. Basically it would say somethin like:
"Dear sir or madam. Yes you may use the MAME name and logo for non-profit purposes. You may not sell the software. You may not sell roms. If you have some for-profit purpose which you would like to discuss further, email us at llicensing at mame dot whatever"
This way it's back to business as usually for Nicola.