Custom Blacklist Contact Form 7

Easily set up a blacklist for those marketing lists that somehow get around Akismet. Throw the below in your functions.php file and customize the $blacklist array to filter by email address to your liking.

function contactFilterBlacklist( $result, $tag ) {
    $valid = true;
    $tag = new WPCF7_Shortcode( $tag );
    $blacklist = array(
        ‘filterme’
    );
    $yourEmail = isset( $_POST[‘your-email’] ) ? trim( $_POST[‘your-email’] ) : false;
    if ( !$yourEmail ) return $result;
    foreach ( $blacklist as $keyword ) {
        if ( strpos($yourEmail, $keyword) !== false ) {
            $valid = false;
        }
    }
    if ( !$valid ) {
        $result->invalidate( $tag, “Uh oh. Something’s wrong here…”);
    }
    return $result;
}
add_filter( ‘wpcf7_validate_email*’, ‘contactFilterBlacklist’, 20, 2 );

Head over to this Contact Form 7 post or their documentation to learn more.

Contact Form Custom Validation