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Exchange back pressure 2007/2010 causes exchange to stop receiving if there is low C drive space

This solution is only part of the fix, you must also plan ahead to delete or move files out of this drive so it doesn’t run out of space and completely corrupt and destroy the server. This fix will just make mail start working in the meantime.

While testing email, I looked in our exchange queue and got message “452 4.3.1 insufficient system resources” while trying to email the server with the issue. I believe it will also have various errors in the event viewer about space and exchange.

To force mail to start flowing, do the following:

  1. Navigate to c:\program files\microsoft\exchange server\bin (for 2007) or c:\program files\microsoft\exchange server\v14\bin (for 2010).
  2. Open the file EdgeTransport.exe.config in notepad so you can edit it.
  3. Find EnableResourceMonitoring and change it from true to false.
  4. Save the file.
  5. Restart the exchange transport service.
  6. Test