Each piece of standard B mail has weight limit of 70 lbs. 5. Express Mail Express mail is the overnight delivery service available from the U.S. Postal Service for both domestic and international addresses. Express mail packages may be tracked to verify date and time of delivery. Unless waived by the sender, all express mail items must be signed for by the recipient. Although all zip codes are not guaranteed for overnight delivery, full refund of postage is available from the U.S. Postal Service if the item is not delivered within its guaranteed time frame.
International delivery varies by country of destination.
The Postal Service offers no guarantees because the destination country's mail service ultimately delivers international express mail. Most items are mailable to foreign countries, however ther are restrictions that vary by country. Letters, documents, and printed matter can be mailed internationally without customs odcumentation if they weigh less than 16 ounces. Any item weighing 16 ounces or more must bear the appropriate signed customs forms or it will be returned to the sender by the U.S. Postal Service. Please contact mail services for restrictions and for the correct customs forms.