I was just recently notified by USPS that they were rolling out a feature that allows you to see scanned images of every piece of mail that is delivered to you each day. It’s pretty handy, and also lets you know tracking status of all of your Amazon packages being delivered as well 🙂
The mobile app works reasonably well and also allows you to see the images of all your mail.
Give it a try here: https://informeddelivery.usps.com if it sounds like something that would be useful to you. I already have accounts with UPS and Fedex that does the same thing for package tracking information, only without the pictures.