Every single hotel that caters corporate clients in the USA still uses fax. We don't get reservations through fax, but that is the best way to get credit card authorization. A lot of corporate booking systems are automated to send out Fax for credit card authorization after they book the room online. Also, it's much better for our Front desk staff, as they don't have to constantly check the email. There is only 1 fax…
Mail delegation covers "anyone can send it out" and 'there is only 1 fax number". Automatically print covers "paper automatically appears" and "don't have to constantly check the email". What exactly are you hoping to modernize (other than "technology A has been around longer than technology B"). If it's hardware e.g. a physical fax machine with a physical line and you want to get rid of that line there are existing…
Fax is not secure.
Something like "Sender goes to the machine, and he punches my number or identification and it prints the document at my hotel"