What is a stream?
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，这一点在同城约会中也有详细论述
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AFP via Getty Images，这一点在同城约会中也有详细论述
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.