Exchange hub transport “Mail.que” file large in size

1. Open exchange management shell and run “Get-TransportServer ” HUB01″ |fl
   
2. Here, look for PipelineTracingEnabled. This should be set to False. If not, run
   
   Set-TransportServer HUB01 -PipelineTracingEnabled $False
   
3. Now run “Get-TransportConfig” and ensure that
   
   MaxDumpsterSizePerStorageGroup is in MB’s and not GB’s
   
   MaxDumpsterTime : 7.00:00:00
   
   If not, run
   
   Set-TransportConfig -MaxDumpsterSizePerStorageGroup -MaxDumpsterTime
   
4. Now run “Get-Queue” and take a look at the count of messages in HUB01
   
5. Goto services.msc and Pause the Microsoft Exchange Transport service
   
6. Again, run “Get-Queue” and ensure all pending messages are “zeroed” out
   
7. Once messages pending becomes zero, stop the Transport service
   
8. Move the mail.que file and all others to a new folder in the same location
   
9. Start the Transport service
   
10. Take a look at the queue again
    
11. You should see that messages would have started getting delivered
    
12. Now you can backup or safely delete the old mail.que file