IP name lookup failed [xx.xx.xx.xx]

[TalentedFool]

Hi All

I've installed an Exchange 2003 server (sp2) on a Wk3 box and when I try and send emails to the outside world I get an NDR back with the following

== SOM ==

Your message did not reach some or all of the intended recipients.

Subject:
Sent: 25/08/2006 14:38

The following recipient(s) could not be reached:

me@nospam.com on 25/08/2006 14:38
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<my_Server_name #5.7.1 smtp;550 5.7.1 <ne@nospam.com>... Relaying denied. IP name lookup failed [1.2.3.4]>

== EOM ==

Now the 1.2.3.4 IP address that seems to have failed the lookup is the IP address of the exchange server. I've checked the DNS and it has a reverse DNS record, DNS looks OK. I am forwarding to a SMART host 10.1.2.3 but from the logs on there - the email never gets to it.

Any body else seen this before? I can't find a simle answer in this theng they call the internet

Thanks guys and Gals - Any help is always appreciated.



~ Remember - Nothing is Fool Proof to a Talented Fool ~

 

[karmic]

First of all, do you have an MX record associated with your ip? Can you "telnet mail.mycompany.com 25"?




~ K.I.S.S - Don't make it any more complex than it has to be ~

 

[TalentedFool]

OK

Sorry for the delay in getting back - have been on hols

Yes, the server has an MX record - and I can telnet to the server on 25.

It seems that the server has been closed for relaying which is my problem.



~ Remember - Nothing is Fool Proof to a Talented Fool ~