It's mostly only mildly useful for me. But I recently had a bank send me a new debit card as mine was about to expire, and the card never arrived. The bank was

It's mostly only mildly useful for me. But I recently had a bank send me a new debit card as mine was about to expire, and the card never arrived. The bank was under the impression it was delivered a certain day, and I was able to tell them that I have Informed Delivery and as far as I could tell, the USPS never even attempted to deliver the card (or, as it happened, anything else that particular day). If you are waiting on a particular piece of mail it sometimes can be handy to know it'll be in your box soon instead of repeatedly checking the tracking or double-checking with the sender. If you don't receive mail every day, and your mailbox is at all exposed to the elements, it can remind you to check the box that day. And if your mail is delivered where other people have access to it—a spouse, kids, roommates, etc.—it can let you know to check in with them if you don't see something that they may have put in an unusual place.