How to send a confirmation email (opt-in email) when a contact form is submitted

1. Click Edit on the page with the form, then click the pencil icon on the form block.
2. Click Edit Form Fields.
3. Click Email. If there's no email field, click Add Field, then click Email, then click Email again to open the field's settings.
4. Switch the Required toggle on. This has to be enabled to store form submitters in your Contacts panel. It ensures the contacts that are created are associated with an email address.
5. To give your visitors the opportunity to accept future marketing contact from you, switch the Email Signup toggle on.
6. To have your visitors opt-in with a confirmation email after submitting their form, switch the Send confirmation email toggle on. Keep in mind, if Google reCAPTCHA is disabled in your form, the confirmation email can't be disabled. All form blocks with Email Signup enabled need at least one verification method.
7. Press Enter or click outside the block editor when you're done.

Visitors and their form submissions appear in the Contacts panel under Form submitters when you have a required email field. With Email Signup enabled, if the submitter checks Sign up for news and updates, they'll also appear in the Contacts panel under Subscribers. Keep in mind, if the confirmation email is enabled, they'll have to opt-in before they'll appear under Subscribers.

To access form submitters and details stored in your Contacts panel, visit Managing form and newsletter storage.