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.