Acknowledgment of receipt (equivalent terms include avis de réception (UPU term), Aviso de Recibo, advice of receipt, advice of delivery (UK and much of the Commonwealth), return receipt requested/required/wanted/demanded (US), Rückschein (Germany), ricevuta di ritorno (Italy), zwrotne potwierdzenie odbioru (Poland), and many others; the standard abbreviations are AR and AD) is a postal service which returns to the sender of a letter (usually registered; in the case of a parcel, it may be insured) a form or card signed by the recipient. This is evidence that the letter was received, and these forms (or cards) are frequently seen with legal endorsements (exhibit A, for example).

1. Please send an acknowledgement of receipt when you get the package.
   收到包裹后請(qǐng)發(fā)送確認(rèn)收訖的通知。
2. The email included an acknowledgement of receipt for the documents sent.
   電子郵件中附有關(guān)于所發(fā)送文件的確認(rèn)收訖通知。