Business Definition for: Double Opt-in

• a type of subscription process for users wanting to sign up to receive specific information or services via a Web site. The double opt-in approach is emerging as the industry standard for subscription management, as it protects the user from being maliciously subscribed to a service by a third party.

  The user requests a subscription, via e-mail or Web form. The vendor's system replies with a verification message, requesting an affirmative reply to the message. Only when an affirmative reply is received from the user is the subscription completed.