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Mailing Standards of the United States Postal Service, International Mail Manual >
4 Treatment of Outbound Mail > 430 Improperly Prepared Mail
If an item is improperly addressed, but the country of destination is legibly written, dispatch it to the exchange office. The exchange office will determine whether the address is sufficient.
Note: Due to heightened security, many foreign postal administrations require complete sender and addressee information in roman letters and arabic numerals on postal items.