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SMTP error

I have a Windows 2003 SBS.  I have a problem emailing one domain through the exchange server.  I  establish a SMTP session.  When I enter the command rcpt to: followed by the email address, I get the following error ERROR:5.7.1:520 Mail accepted only via mx routing. All the mail to his domain is stuck in Queue.  I have check my DNS setting and have done nslookup testing and I am able to resolve the mx record just fine.  I have tried googling the error and had no luck finding an answer.  I really appreciate some help with this for I have been fighting this for 2 days.

Thanks
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adsnetcurve
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adsnetcurve
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1 Solution
 
travalCommented:
This type of problem could indicate that you have open relay on your server, and that particular server has black listed you.

http://support.microsoft.com/default.aspx?scid=KB;EN-US;324958
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adsnetcurveAuthor Commented:
I have tested it and I know it is not an open relay, but we did just get the IP#.  So somone before use could have be blacklisted.  When I go to www.dnsstuff.com and test it there I do not get any failures but there are a couple of sites that have minor DNS issues.
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travalCommented:
I'd recommend running your IP thru a few RBL lists, here's one to try:
http://rbls.org/

Also, you might consider posting a link to this question in the Exchange Server forum.
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