Hello,I would really like to receive

Hahahhhahahaa - Sorry to disappoint you but you live in a rose tinted world where Italy works.   PEC is the same a registered mail, but you shouldnt imagine for a minute that the AdE will use it to contact you.   Your best bet is to register on the AdE and Equitalia site - this is a long land laborious process whereby you will be finally allowed to get a user name and password , but which must be sent by post in two parts - and can then log on to see what the tax man thinks you owe.  For anything else you will still get mail and still have to go to the office and queue even if you use the online booking system which doesnt quite work - software is all out of date and they dont know how to use it.    Are the bills in your name? In which case you can legitimately ask that they send you them to your address - unless you have residence at your fathers address, and that will save some of the hassle.   The other option is to pay your bills and do your calculations on time, so you dont get the letters from the AdE or Equitalia.    Perhaps in a couple of years the PEC thing might work - Im still waiting for replies from the questura, AdE and other offices through PEC - but nobody reads them.