USPS scans the mail. I haven’t signed up for the Informed Delivery service, though. I wasn’t even tempted until our mail carrier retired last year. Now the entire neighborhood’s delivery frequency is inconsistent - days with nothing, followed by one day with a ton of items.
Given how many letters now wind up in my mailbox by mistake, I’d rather see a wrong name/wrong address detector that rejects items before the new mail carriers shove them in (like the dollar bill scanner on a snack machine). I wouldn’t be averse to the “mild electric shock” feature, in cases where the street name and number are not even close. There’s got to be some incentive to get them to read and count correctly, right?