Block Specific Emails From Subscribing

You can block specific email addresses from being able to subscribe to your site during the Leaky Paywall registration process.  You can specify multiple blacklist strings and/or domains to block.

When an individual with a blocked email address tries to subscribe, they would receive a notification saying they cannot subscribe with that email address.

The following code snippet shows how to use the leaky_paywall_account_setup_validation filter to accomplish this.