Use Certified Mail to have access to information on delivery or delivery attempt(s) made. When combined with Return Receipt, you can get the signature of the person who accepts the mailing. Provide ...

USPS will not raise the prices on its "Market Dominant" products, which include certified mail; first-class mail; library ...

If your first-class item weighs more than 11 ounces, use Priority Mail. Additional services such as certificates of mailing, certified, registered and c.o.d. can also be purchased for First-Class ...