Why would USPS send me a letter?
What happens to your letters when the USPS picks them up?
How To Mail a Letter Or Postcard
How USPS Sorts Mail
How the US Postal Service reads terrible handwriting
How USPS certified mail works!
Gephardt: Can The US Postal Service Refuse To Deliver Your Mail?
Postal procedure sends mail back to sender
Journey of a Letter
U.S. Postal Service warning users against sending checks through the mail
Good Question: How does the post office deliver mail?
USPS test: We mailed 4 packages with GPS trackers to see how quickly they got there
13 Investigates: How long should it take for the postal service to deliver your packages?
History of USPS letter boxes
Systems at Work
Know What You’re Mailing: Letters vs. Flats vs. Parcels
How the U.S. Postal Service Works
USPS mail delivery times
How mail agencies identify suspicious packages
HOW TO ADDRESS A PACKAGE