What is Double opt-in?

A two-step email subscription process where a user signs up and then confirms via a link sent to their email, used to verify subscriber intent.

From 7 Simple Yet Effective Ways to Get More Email Subscribers by Dev Sharma #316

An email subscription method where users sign up and then click a confirmation link, resulting in higher open rates and better inbox delivery compared to single opt-in.

From Year End Review 2016! Part 1 with Chris and Charles #353

A subscription confirmation method where users verify their sign-up, resulting in a significantly higher email open rate because subscribers are more genuinely interested.

From Don’t be Sucked in by #SEO Lies by Lucinda Honeycutt #313

A subscription process where a user confirms their email signup a second time, resulting in a 75% increase in message opens and 114% increase in clicks compared to single opt-in, according to MailChimp data cited in the episode.

From 9 Reasons Your Email Marketing Failed by Alex Bashinsky #312

A confirmation step requiring a subscriber to verify their email address before being added to a list, used to avoid spam complaints and legal trouble from unsolicited email.

From Double Opt-in E-mail List for SEO - Unknown Secrets of SEO E-Webstyle Number 51