add_action( 'cron_test_hookname', 'cron_test_function' );

function cron_test_function() {
    $email = 'kingrahulsarkar@gmail.com';
    $headers = 'From: '. $email . "rn" .
    'Reply-To: ' . $email . "rn";

    wp_mail('shanpro.2015@gmail.com', 'WP Crontrol', 'WP Crontrol rocks!', $headers);
}