What does it mean when an email address is Grey-listed?

Created by Matt S., Modified on Wed, 22 Sep 2021 at 04:14 PM by Matt S.

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.

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