Цены на нефть взлетели до максимума за полгода17:55
Москвичей предупредили о резком похолодании09:45
。关于这个话题，51吃瓜提供了深入分析
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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.