title: Error handling in Azure function when used with SendGrid as output binding
body: <p>I have a C# Azure function with output binding to SendGrid.
  This Azure Function gets triggered when a message arrives in a ServiceBus topic. I operate on message and finally returns SendGridMessage. Hereon, SendGrid is responsible for sending out the actual email. </p>
  
  <p>But in this whole scenario, Azure function does not get to know if the email is delivered or failed. Is there any way or hook available which can give me the aforementioned details ?</p>
  
  <p>Any links, examples are appreciated.</p>
  
  <p>Thanks </p>