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IMM Issue 37 - International Mail Manual >
3 Extra Services > 340 Return Receipt > 344 Processing Requests
The sender must enter the return address on the return receipt.
The accepting clerk must:
The accepting clerk must mark address side of item either “AVIS DE RECEPTION” or “A.”
If the sender does not receive a return receipt for which a fee was paid, or if the sender receives an improperly completed return receipt, an inquiry may be filed. (See 920 for inquiry procedures.)