最后，我们要创建一个程序，让它来比较这些日期，创建电子邮件消息并发送这些消息。
Finally, you'll create the routine that compares these dates, creates the E-mail messages, and sends them.
这个程序还设置了电子邮件标题、邮件程序和发送日期。
The program also sets the subject of the E-mail, the mailer, and the sent date.
测试电子邮件广告的要素包括：发送日期和时间、频率、个性化、主题和内容、价格和推广的行动。
Ideas for testing email campaigns include: sending day and time, frequency, personalization, subject and contents, prices, and call to action.
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