.NET SMTP Client - Client does not have permissions to send as this sender

Question

I\'m getting strange occurance on our servers when I am trying to send an email using SmtpClient class via an ASP MVC3 project. This is the code I am using.

Answer 1

What does User.Identity.IsAuthenticated return, if it returns false that is your problem. You are trying to send mail as an unauthenticated user.