Spam site registrations or spam form submissions can be blocked by being able to detect and block emails from being used on your child site. There is a new plugin called Ultimate Email Validator.
After the plugin has been installed and activated on the site it will add a new admin menu called;
Ultimate Email Validator
Ultimate Email Validator uses the SOLYD free API Block Temporary Email to detect and stop the following actions registration, update a user profile, post comments or using contact forms using temporary or disposable email addresses to keep your database clean with real customers that you can reach them. The plugin detects email fields on the popular plugins registration forms or site forms. In the plugin settings on each of the tabs for the plugin, you can set the custom message for that plugin.
By default all of the integrations other than WordPress functions will be enabled by default;
Contact Form 7
Manage all your WordPress sites with the MainWP Dashboard
WordPress Management for Professionals
Are you ready to go Pro?
All MainWP Pro Extensions are available through one of our convenient bundled packages.
By using the Ultimate Email Validator plugin on your child site it will help cut down on spam registrations in WordPress, BuddyPress, and WooCommerce. As well as cutting down on spam form submissions if Contact Form 7, Gravity Forms or NinjaForms.