It's not necessary to reply to a mass email sent to numerous recipients.
2018年12月四级真题（第二套）听力 Section C
英语六级真题
When these students encounter a new problem of the same type on a test, they're able to transfer the knowledge they've gathered more effectively than those who were the passive recipients of someone else's expertise.
出自-2013年12月阅读原文
柯林斯高阶英汉双解学习词典释义
N-COUNT
接受者；领受人
The recipient of something is the person who receives it.