Double opt-in
Also called: double opt-in(doi)
As with regular opt-in, with double opt-in the owner of an e-mail address explicitly consents to the use of his address to receive, for example, a newsletter via e-mail. With double opt-in, this consent is confirmed twice. For example, after subscribing to a newsletter via the website, the newsletter subscriber must confirm this subscription once again by clicking on a unique link in an activation email.
