If you need your packages delivered overnight, Priority Mail Express is a great option!  The mail service provides the fastest delivery offered by the U.S. Postal Service with delivery occurring 7 days a week, 365 days of the year.  The USPS also offers a money-back guarantee if your package is not delivered on time.

The Money-Back Guarantee
Unlike First Class Mail or Priority Mail, Priority Mail Express has a money-back guarantee if your mailpiece is not delivered by the promised time.  The money-back guarantee is contingent on a number of factors including the package drop-off time as well as the origin and destination zip codes.   You can access specific guaranteed times here: http://postcalc.usps.com/ServiceCommitments.aspx.

How do I get a refund on late Priority Express Mail?
So what happens if your mailpiece is not delivered by the specific commitment time?  The USPS handles delivery of your mailpiece, so even if the postage on your mailpiece is printed via the Stamps.com platform, the USPS will be responsible for the refund.

For domestic mail, if your Priority Mail Express item is not delivered by the guaranteed time, please visit your local Post Office no later than 30 days from the date the item was mailed.  Before you go, please take with you a copy of the receipt from your Print History.

If you’re logging into the Stamps.com software, click on “Search” on the left side of your software screen and click on the info box (i) that corresponds to the label/tracking number in the Print History.  Click on “Print” to generate a physical copy of your receipt.

If you’re logging into Stamps.com Online, click on the “History” tab at the top of your screen and select “Search Print History.”  After that, the instructions are the same as for the Stamps.com software.

At the Post Office, the window clerk will ask you to complete PS Form 3533 (Refund for Postage).  Please be aware that the form is not available online.  Once your claim is verified by the clerk, your claim will be paid by cash or money order.

How do I get a refund on late Priority Express Mail for international mail?
For international mail, a money-back guarantee is currently available for Priority Mail Express International items sent to the following countries:

• Australia,
• Canada,
• China,
• France (does not include Corsica and Monaco),
• Germany,
• Hong Kong,
• Israel,
• Japan,
• New Zealand,
• Singapore,
• South Korea,
• Spain (does not include the Canary Islands),
• Sweden,
• Switzerland,
• Thailand,
• United Kingdom.

You can initiate a request for a postage refund with the USPS no later than 30 days from the date of mailing by calling 1-800-222-1811 or by going to the International Claims Inquiry Page at https://www.usps.com/ship/file-international-claims.htm.