USPS offers a comprehensive list of services under the overall title of "Informed Delivery" -- Track packages, buy and print shipping labels, get postal supplies delivered, schedule pick-ups at your residence or place of business, etc. Similar to UPS' "My UPS."
I find it extremely helpful, especially at this time of the year when sending packages: box the item up; weigh it on an inexpensive digital scale; print the shipping label; schedule a pick-up; and, track the package as it makes its way to its destination.
The last bit can be a cause of anxiety as it was for me these past several days after shipping a custom paint project to the painter in PA. Instead of the normal tracking info showing the package p/u; receipt at my local post office and so on, NOTHING was tracking from the time I handed it to my carrier on the 18th--NOTHING. And I always use a tracking feature of Inormed Delivery by which the shipper (me) receives texts and emails for each change in the path through the USPS system--I wasn't getting any texts or emails on this, for me, important package.
Until this evening when I received both telling me the package was at a distribution center in Pittsburgh. One more day and the painter should have the package.
I really like "Informed Delivery" for the great convenience it usually is, but there are the occasional hiccups that induce anxiety. Check it out if you haven't already.
Meanwhile, I'll let you know about the paint project soon, I hope.