I wish we could just phase out the USPS altogether and make better use of email. Get the big providers on board with some sort of signed delivery and receipt confirmation system, with an optional tie in login.gov identity verification for official matters.
The only mail I've gotten in the last 20 years is spam and receipts from old school companies they refuse to go paperless (usually some form of insurance).
It's such an antiquated, annoying system, and I wish it didn't exist so that agencies and businesses would be forced to use a more modern alternative.