Deliverable - We can determine with a high level of confidence that the email address is associated with a valid account.

Undeliverable - We can determine with a high level of confidence that the email address is not associated with a valid account. 

Risky - Emails are deliverable, but should be used with caution due to low quality or deliverability. May include Accept All, Disposable, and Role addresses. 

Unknown - The domain associated with the email address is not responding, meaning we cannot determine the validity of the email account.

Duplicate - The list contains more than one of the same email. 

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