名词
中文翻译：未支付的信件
同义词：
['unauthorized correspondence', 'unsolicited correspondence']
例句：
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1. The company's policy prohibits unpaid correspondence from being sent to customers.
公司的政策禁止发送未付费的通信给客户。
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2.The sender of the letter was unaware that it was unpaid correspondence.
寄信人不知道这是一封未付的信件。
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3. The company received numerous unpaid correspondences, which they were unable to process immediately.
公司收到了许多未付的信件，它们无法立即处理。