1、首先，登录自己的gmail邮箱，然后点击邮箱界面右侧的齿轮状选项。
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2、然后选择弹出的菜单中的“设置”选项，如果使用的是英语版，就选择setting，
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3、进入设置页面，默认打开的是常规选项，第九个选项是“撤销发送”，现在是没有启用的状态。
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4、点击“启用撤销发送”前面的checkbox选项框，并且设置发送取消时间。
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5、然后，滑动整个页面到底部，然后单击页面底部的“保存更改”选项。
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https://iknow-pic.cdn.bcebos.com/9f2f070828381f30ac477f47a7014c086f06f086"/>
6、可以尝试发送一封邮件，邮件发送后，会有一个“撤销”选项出现，点击“撤销”就可以撤销之前发送的邮件了。
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