Confirmation: An acknowledgment of a subscription or information request. “Confirmation” can be either a company statement that the email address was successfully placed on a list, or a subscriber’s agreement that the subscribe request was genuine and not faked or automatically generated by a third party.

Confirmed opt-in: Inexact term that may refer to double-opt-in subscription processes or may refer to email addresses which do not hard bounce back a welcome message. Ask anyone using this term to define it more clearly.

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