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Postal Explorer > Publication 51 - International Postal Prices and Fees > Categories of International Mail Categories of International Mail Categories of International Mail Global Express Guaranteed (GXG) Express Mail International Priority Mail International Flat–Rate Envelope Flat–Rate Boxes First–Class Mail International Postcards M–bags (Direct Sacks of Printed Matter to a Single Addressee) Free Matter for the Blind or Other Physically Handicapped Persons International Commercial Services International Priority Airmail (IPA) International Surface Air Lift (ISAL) Extra Services Certificate of Mailing Certified Mail and COD Mail Priority Mail International Insurance Indemnity Coverage Registered Mail Return Receipt Restricted Delivery Miscellaneous Services International Postal Money Orders International Reply Coupons International Business Reply Service Mail Preparation Addressing Destination Address Sender’s Return Address Size Limits — Express Mail International Size Limits — Priority Mail International Size Limits — First–Class Mail International Postcards Letters Surcharge for Nonmachinable Letters Large Envelopes (Flats) Packages (Small Packets) Rolls Markings and Endorsements Sealing Customs Declarations Requirements Exemptions Customs Declaration Forms Customs Form Usage Express Mail International Priority Mail International Parcels First–Class Mail International Items, Matter for the Blind, and M–bags Prohibited and Restricted Articles