: Relay access denied

I am having a problem with SMTP relay into our new email server. The server, mail.domain.com, is able to send messages without a problem.

- I have setup domain.com with the registrar.
- Set up an A record for mail.domain.com > 102.103.104.105
- Setup an MX record for domain.com > messages handled by > mail.domain.com
- double checked all port 25 SMTP traffic goes to server

However, messages still don't get through. HOw can I narrow down / diagnose / solve the problem?

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Reporting-MTA: dns;blu0-omc1-s38.blu0.hotmail.com
Received-From-MTA: dns;BLU129-W17
Arrival-Date: Wed, 25 Feb 2009 11:19:37 -0800
 
Final-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;554 5.7.1 : Relay access denied

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Answer : DNS / MX record config problem? Diagnostic-Code: smtp;554 5.7.1 <[email protected]>: Relay access denied

It thinks its relaying which suggests that it isn't treating domain.com as inbound at all. It should be replicable if you use Telnet to attempt delivery.

e.g.

telnet 25
helo there
mail from: [email protected]
rcpt to: [email protected]
data
.
quit

If it is going to return the message above it should do so immediately after rcpt to has been issued.

Is something sitting on top of SendMail? Or is it nothing more than a very basic SendMail server?

Chris