I have a Windows 2003 server that I'm trying to get the built in IIS SMTP server to work correctly. Unfortunately, every time I try to send an email through (usually via telnet) it doesn't relay.
I've double checked the DNS records on the domain, and the MX records are correct. I also switched the mail server to use ArgoSoft's free SMTP server, using google's DNS, and messages relayed perfectly.
In IIS I do have relaying turned on with no authenticated needed.
Is using Server 2003 as an SMTP server without Exchange possible? If so, would you know if there is a step I'm missing?
Any advice or help is much appreciated.