.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

One thing worked for me using Visual studio 2013 running packages. i removed the 'Use Windows Authentication' tag in the SMTP Connection Manager Editor.