~ Marie Curie (November 07, 1867 - July 04, 1934)
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However, even the most impressive delivery statistics can hide deliverability problems because there are of course many legitimate reasons why e-mail messages can't be sent. People switch jobs or change ISPs and don't bother to update their e-mail address with everyone. But to really know why individual recipients aren't getting your mail, you need to look at the rejection messages too.