add_action( 'init', 'wootickets_stop_sending_email' );
function wootickets_stop_sending_email() {
 	$woo = TribeWooTickets::get_instance();
	remove_filter( 'woocommerce_email_classes', array( $woo, 'add_email_class_to_woocommerce' ) );
	add_action( 'woocommerce_email_after_order_table', array( $woo, 'add_tickets_msg_to_email' ) );
}

add_filter( 'wootickets_email_message', 'replace_wootickets_order_msg' );

function replace_wootickets_order_msg() {
    return '';
}