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.
// Sync variants return boolean (true = accepted)
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（一）具有批量控制网络账号、上网线路、智能终端等功能的；
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