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IMM Issue 35 - International Mail Manual >
3 Extra Services > 340 Return Receipt > 342 Availability
Return receipts can be purchased only at the time of mailing and are available only for registered items and insured parcels. Return receipts are also available to a limited number of countries for Express Mail International (see 221.4). Some countries do not admit return receipts or restrict them to Registered Mail items. See Individual Country Listings.