What is the differance between courier service and postal service?
A courier service can be set up by any private person, but cannot put anything in mailboxes. Courier services are unregulated so be very careful because if your pal gives his money to a courier and the courier disappears his money is not insured and you re out of luck. The Postal Service is a federally regulated delivery service which has delivery and service guarantees. The USPS picks up and delivers to mailboxes at every home and business in the USA.