sender
['sendər]
n.
寄件人;
[信]发报机，发射机，发送机，送话器;
发送人;
（天线）引向器;
例句:
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On the customs declaration, the sender labeled the freight as agricultural machinery.
在报关单上，寄货人将货物列为农用机械。
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If undelivered, please return to sender.
若无法投递，请退还寄信人。
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Undeliverable, returned to sender.
无法投递, 退回原处.
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You click, because you trust the sender.
来自THETIMES
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It will be up to the sender to classify the document.
来自THETIMES
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They tap in a response which is received by the original sender.
来自BBC