What is double opt-in?

Double opt-in is a method for opting in or subscribing to an email newsletter or marketing communications. Where single opt-in mechanisms would let you sign-up with just a single action, such as clicking a button on a website, double opt-in methods combine two mechanisms – such as signing up by a button on a website and then confirming that opt-in with an email requiring an action.

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• Single opt-in
• Opt out