Question : Exchange Error as posted

How do I fix this  ?????

Testing Inbound SMTP Mail flow for domain [email protected]
  Failed to test inbound SMTP mail flow.
   Test Steps
   Attempting to retrieve DNS MX records for domain duellhunt.com
  Successfully retrieved one or more MX records from DNS
   Additional Details
  MX Records Host mail.duellhunt.com, Preference 10
 
 
 Testing Mail Exchanger mail.duellhunt.com.
  One or more SMTP tests failed for this Mail Exchanger.
   Test Steps
   Attempting to resolve the host name mail.duellhunt.com in DNS.
  Host successfully resolved
   Additional Details
  IP(s) returned: 96.37.137.82
 
 Testing TCP Port 25 on host mail.duellhunt.com to ensure it is listening and open.
  The port was opened successfully.
   Additional Details
  Banner Received: 220 mail.duellhunt.com Microsoft ESMTP MAIL Service ready at Wed, 19 May 2010 13:20:35 -0500
 
 Attempting to send test email message to [email protected] using MX mail.duellhunt.com.
  Delivery of the test message failed.
   Additional Details
  Server returned status code 452 - Insufficient system storage. The server response was: 4.3.1 Insufficient system resources
Exception details:
Message: Insufficient system storage. The server response was: 4.3.1 Insufficient system resources
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
 
 
 
 
 

Answer : Exchange Error as posted

This is backpressure algorithm of exchange

make sure you have enough free hard disk and your rams are not full..

try restarting the Information store to free ram and backup to free hard disk space