Processing incoming emails from SendGrid.

SecretController.cs

[HttpPost]
[ValidateInput(false)]
public ActionResult ProcessIncomingEmail(IncomingEmail email)
{
	var serializer = new JavaScriptSerializer();
	serializer.RegisterConverters(new[] { new DynamicJsonConverter() });
	email.envelope = serializer.Deserialize(HttpContext.Request.Form["envelope"], typeof(object));

        // Parse incoming to: email address
	// Do something

        return new EmptyResult();
}

public class IncomingEmail
{
	public string text { get; set; }
	public string html { get; set; }
	public string from { get; set; }
	public string to { get; set; }
	public dynamic envelope { get; set; }
}