private static void Main()
{
// v3 Mail Helper
HelloEmail().Wait(); // this will actually send an email
KitchenSink().Wait(); // this will only send an email if you set SandBox Mode to false
// v3 Template Example with Mail Helper
TemplateWithHelper().Wait();
// v3 Template Example without Mail Helper
TemplateWithoutHelper().Wait();
// v3 Web API
ApiKeys().Wait();
}