Getting a ASP Error: Mailbox unavailable. The server response was: Access denied – Invalid HELO name (See RFC2821 4.1.1.1)

I am getting an error and I know my credentials are correct. Any ideas? This is on a Windows Server but I am wanting to use Hostgator SMTP settings for my email. This is what happens when I submit a simple contact form. ERROR: Mailbox unavailable. The server response was: Access denied – Invalid HELO … Read more