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Exchange Tranpsort rejecting message submissions

All of a sudden this afternoon my Exchange 2010 server stopped delivering external messages to my users.  I restarted the Exchange Transport service thinking this would do the trick but to no avail.  Then I looked in the Event Viewer of the Exchange server and saw the following error message:

Log Name:      Application
Source:        MSExchangeTransport
Event ID:      15006
Task Category: ResourceManager
Level:         Error
Keywords:      Classic
User:          N/A

Description: Microsoft Exchange Transport is rejecting message submissions because the available disk space has dropped below the configured threshold.The following resources are under pressure:Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\") = 95% [Medium] [Normal=93% Medium=95% High=97%]

The following components are disabled due to back pressure:
Inbound mail submission from Hub Transport servers
Inbound mail submission from the Internet
Mail submission from Pickup directory
Mail submission from Replay directory
Mail submission from Mailbox server
Mail delivery to remote domains
Loading of e-mail from the queuing database (if available)

The following resources are in normal state:Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\mail.que") = 95% [Normal] [Normal=95% Medium=97% High=99%
Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200]
Private bytes = 0% [Normal] [Normal=71% Medium=73% High=75%]
Physical memory load = 88% [limit is 94% to start dehydrating messages.]
Batch Point = 0 [Normal] [Normal=2000 Medium=4000 High=8000]
Submission Queue = 0 [Normal] [Normal=1000 Medium=2000 High=4000]

I saw an article which stated that I can modify the edgetransport.exe.config file and change the "EnableResourceMonitoring" from "True" to "False", save and close the file, then restart the Microsoft Exchange Transport Service. After doing this email flow started working again.

My concern though is that the mail.que file is 27GB on a 64GB hard drive and there is about 3GB of free space.  Can this file be deleted occasionally?  I don't want this 1 file filling up my hard drive and crashing my server. Any assistance is greatly appreciated. Thanks!

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1 Solution
Bruno PACIIT ConsultantCommented:

First of all, the best practice and the real good idea is to move the transport queues to another partition, other than the system partition.
So that your server will stay available even if the transport queue fills its disk.
If your system partition comes out of space, of course Exchange services will stop, but also you'll have very hard time to connect to your server and launch commands and tools for diags.

So... as soon as possible, create a D: partition and move transport queues to this partition.

About mails stored in the queue. You should be able to delete them using the EMC. You can look at your message queues, look at the messages in it and also the reason of the delivery failure. According to this delivery failure you should be able to decide to delete the message or not.

You can also do that from EMS (Exchange Management Shell) using cmdlets "Get-Queue" and "Get-Message". You can use filtering ability of Powershell to only filter messages in queues that are blocked for a specific reason and then use another cmdlet to remove these messages.

Have a good day
Bruno PACIIT ConsultantCommented:
Hi again,

By the way, disabling "Resource Monitoring" so that Exchange services will restart is OF COURSE a TEMPORARY solution !!!!
You must not let your platform in this situation, you should do things so that your leak of disk space is repaired and so that it will no more occur, and THEN YOU MUST reenable resource monitoring !! Of course ! :)
jmerullaAuthor Commented:
Plan to move the mail.que file to another larger hard drive afterhours when I can stop mail flow for a little bit.  Then I'll re-enable the resource monitoring ;-)
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