Where can I ask questions about mail?

Questions about U.S. mail must be directed to the United States Postal Service. The USPS has a helpful customer service portal on its website, which provides answers to frequently asked questions and provides toll-free numbers for domestic mail inquiries.

In addition to USPS's Frequently Asked Questions section, the official website offers information about tracking packages and filing domestic or international claims and also gives instructions on how to deal with improperly delivered mail. USPS.com also details up-to-date information on shipping fees, stamp prices, what to do about mail fraud and other topics of interest to those sending post in the United States.