关掉电子邮件程序的自动通知功能。
如果用户取消选择该选项，该设置会向使用收回功能的用户发送通知，声明无法收回邮件。
If the user deselects this option, the setting causes a notice to be sent back to the recalling user stating that the message cannot be recalled.
为了测试Team Room的通知功能，而不必访问外部网络，也不使用电子邮件检验系统，我们可以编写mock测试方法。
In order to test our Team Room notification function without accessing the external network or having an email validation system in place, we can write mock test methods.
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