You can use any email address or forwarder, that does not affect this plugin.
Assume your php version in 5.3+, add following code in your theme’s (child theme’s if any) functions.php to exclude users, change 1,2,3 with your actual user ids
add_filter( 'fep_directory_arguments', function( $args ){
$args['exclude'] = array( 1, 2, 3 );
return $args;
});