back to the old days, when email just came to people's life, the feature of receiving confirmation was often built in the email system. So when you send out an email, you will get a notice indicating that your email has reached to the guy you are sending to. But we can barely find any email system still have this functionality working by default, because soon after people adapted to email, they were frustrated and overwhelmed by the number of receiving confirmation notices they got. They would rather assume that there is nothing wrong and turn that function off, just like what people do with the mail services.
But in retrospective, this function did help for people who use email for their first time and are anxiously waiting for results. We changed the system simply because we ourselves have changed. This is a typical story of evolution.
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