Double opt-in requires users to confirm their subscription, improving consent and reducing bad addresses. Learn how double opt-in works and when to use it.
Double opt-in is a subscription method where a user signs up and then confirms that signup via a follow-up email. This second step verifies ownership of the email address and reduces accidental or fake subscriptions.
Double opt-in improves list quality by reducing typos, bots, and low-intent signups. It also creates a stronger compliance posture because you can demonstrate confirmation behavior if needed.
The trade-off is lower list growth because some users won’t complete the confirmation. Many teams use double opt-in for newsletters and high-volume marketing, while using single opt-in for low-risk contexts where friction is a bigger concern.