time.sleep(2 ** attempt) # 指数退避
But I can accept that. I'll be very good at dreaming by then.
，更多细节参见safew官方版本下载
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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