Email Verification API
There are only 4 statuses for an email address in Email Verifier App.
Valid: Email represents a real account / inbox available
Invalid: Not a real email address / inbox unavailable
Unknown: For some reason, we cannot verify email address as being valid or invalid. Most of the time a domain email servers did not respond quickly enough.
Accept All: These are domains that respond to every email verification request in the affirmative, and therefore cannot be fully verified. They could be valid or invalid.
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