MailChimp changed their default subscriber setting to single opt-in – in other words, a subscriber submits a subscription form connected to the MailChimp API and is automatically subscribed. Double opt-in is when the subscriber submits the form and receives an email asking for subscription verification.
If you're using the Beaver Builder Subscribe Form module, you can enable double opt-in with a Beaver Builder filter.
To enable double opt-in for MailChimp with the Subscribe Form module:
Add the following code to your child theme's functions.php file.// Enable double opt-ins.add_filter( 'fl_builder_mailchimp_double_option', '__return_true' );
By default, the double opt-in setting in Beaver Builder is
false, but this
filter sets it to