These are domains that don't respond to our query in the first attempt. Like they won't tell whether the user exists or not in the first attempt. It requires a second attempt after 5 to 10 hours to get the exact result. So, all such emails can be re-uploaded for verification after 5 to 10 hours.
What does it mean when an email address is Grey-listed? Print
Created by: Matt S.
Modified on: Mon, 22 Jun, 2020 at 3:55 PM
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