This story was originally featured on Fortune.com
If the subject line of the email is irrelevant to customers, they will ignore it multiple times. But, if it keeps repeating, they are intercepted and unsubscribed from your emails. So, send relevant emails for the benefit of the customer. Don't send emails that often only focus on sales, offers and discounts.
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Фото: Kuba Stezycki / Reuters，更多细节参见搜狗输入法下载
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