I'm doing some research on the email addresses that were sent but not deliverer. I noticed a number of email addresses for our members with the domain 162.com and 163.com. From what I've been able to tell via limited research, these domains could potentially be fake. Because these email addresses are linked to our members, I would think they would be legitimate. Do you have any information about these domains that you can share? Thank you.
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They are free email ISP from China. At the Marketing Open Data Project there is a pretty comprehensive list of the free and disposable email provider domains from around the world, about 8,200+ domain: