I have an issue on one of my Web Applications after moving to a New Windows Server. The Web Application doesn't send out emails to Domains outside our Domain. Other domains like gMail, Yahoo, AOL or any other domain IDs. I used the same code which was working on my old Server but doesn't work now after moving to a new Server. I need someone who has fair idea of Windows Settings along with .NET Experience would be good. Need to work remotely on my Server.
Exception: Mailbox unavailable. The server response was: 5.7.1 Unable to relay