Not quite. Double opt-in is a function offered by most third-party email service providers (ESP) and enables marketers to send an email after a visitor has signed up, inviting the visitor to confirm his/her email address and consent to receive further email communications. Under the terms of the GDPR, double opt-in is generally not an acceptable means of obtaining active consent. Because exceptions to this rule do exist in certain cases, we recommend you first seek legal counsel to help craft the necessary compliance statements necessary to deploy double opt-ins.
Re-target website visitors who don't convert the first time. You won't be able to capture lead information for all of your website visitors, but that doesn't mean you should give up on the visitors who don't convert. Consider running a retargeting campaign so you can display advertisements on popular websites which will display only to people who visited your website. This will give you another chance to draw them back in.