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Again, the answer to this question varies from company to company. And again, testing is the way to find out what works best. Typically, weekends and mornings seem to be times when multiple emails are opened, but since your audience may have different habits, it's best to experiment and then use your data to decide.
。下载安装 谷歌浏览器 开启极速安全的 上网之旅。是该领域的重要参考
输出必须是 JSON，字段固定：
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