• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 567
  • Last Modified:

IIS SMTP Relay issue

I have a windows 2003 server running IIS.  I have turned SMTP on.  
I can configure Outlook express to send emails from the server as long as I set the
"Outgoing mail (SMTP):" to
The server has a domain name associated with it.
I would like to be able to set the "Outgoing mail (SMTP):" to the domain name instead of the localhost ip.
Also, I need to be able to send without authenticating, therefore I believe I need to add th domain name to the relay exception list.
Someone suggested that I may need to contact the domain admin (Network Solutions) and have them update a DNS entry?
2 Solutions
Are you running OE on the server machine? If so, it's logical that you can use "localhost" as outgoing SMTP server. It doesn't matter for mail delivery AFAIK, but the DNS records for your server IP needs to be configured correctly, otherwise your mails will be rejected by many receiving servers and you may end up on blacklists.
Since you are sending it from the server itself you can use the 127 ip or local host. As far as using the domain name... the server needs to have a registered doman (  you are participating in the internet now ) This will enable others who configure the mail account in their OE to use that domain name ( eg: mail.yourdomain.com)  now as you see mail.yourdomain.com is a internet address and should be reachable froom anywhere, you have to register. Register the domain.. have the MX record pointing to your server. then control relay  otherwise you will be black listed in real quick.
kevinvw1Author Commented:
I got the MX updated.  But I am discovering something strange...
I can do the following ->  Telnet 25 and I get a response from the SMTP server.
But if I use the server's actual ip address and do -> Telnet 25 I do not get a response.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now