Cannot send mail to a specifics domain

When I try to send mail from my Exchange 2003 server I get the following error message.  

   'tcooper@doremusfp.com' on 12/6/2007 3:59 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <ADSEMAINDC2.adsemain.com #5.5.0 smtp;550 No such domain at this location (tcooper@doremusfp.com)>

I have logged onto our exchange server and gone to the command prompt and was able to look up the mx record for doremusfp.com.  I was also able to also establish and smtp session through the command prompt to their mail server.

The question is why am I getting the error saying it can not find the domain?
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adsnetcurveAsked:
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SembeeConnect With a Mentor Commented:
The error means that the server the message was delivered to doesn't recognise the domain. It does not mean that the message was delivered to the correct server.
The fact that you can make a connection to the server listed in the MX server means the server is alive - I don't doubt that as it will have generated the NDR.

It could be that the receiving company is changing servers, or their host has issues. It could be the host is using a cluster of servers and one of them is failing.

What I can say it is not an Exchange message, so I don't think it will be a problem with your server. Presuming that you send email directly you could try an SMTP connector to send email for that domain via your ISP to see if that is more successful.

Simon.
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