<?php add_filter( 'bricks/form/validate', function( $errors, $form ) { $form_settings = $form->get_settings(); $form_fields = $form->get_fields(); $form_id = $form_fields['formId']; // Skip validation: Form ID is not 'kfbqso' if ( $form_id !== 'kfbqso' ) { // Early return the $errors array if it's not target form return $errors; } // Get submitted field value of form field ID '7e30aa' $email_address = $form->get_field_value( '7e30aa' ); // Error: Email from registered user (show error message, and don't send email) if ( ! email_exists( $email_address ) ) { // Add error message to the $errors message array $errors[] = esc_html__( 'This email address is not in our system, sorry.', 'bricks' ); } // Make sure to always return the $errors array return $errors; } );