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[RESOLVED] Exchange 2013/2016 hub transport Mail.que file large in size

[RESOLVED] Exchange 2013/2016 hub transport Mail.que file large in size

Bastian W.Oct 13, 2016Articles \ Exchange

Abstract: You discovered that something on your Exchange Server (2013/2016) keeps eating your disc space. During troubleshooting you found out that the mail.que file has a size from many GB.

By default, the transport queue database (mail.que) is located at C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue:

In the example above you can see that the mail.que is already 140 GB in size, which is really big and caused therefore a lot of space issues. According to Microsoft the mail.que is an ESE Database, so its similar like to an *.EDB database which holds the mailboxes. So there is currently no build in option to "shrink" the mail.que to a smaller file. The only way to get a smaller mail.que would be to rebuild it. But before we run true the steps to rebuild it, you should check some settings which might caused the issue:

1.) Check the SafetyNetHoldTime value. This parameter specifies how long a copy of a successfully processed message is retained in Safety Net (as written here). Unacknowledged shadow copies of messages auto-expire from Safety Net based on adding the values of the SafetyNetHoldTime parameter and the MessageExpirationTimeout parameter

Run the command below to check if your SafetyNetHoldTime was changed or is still on 2 days:

Get-TransportConfig | select SafetyNetHoldTime

The default value here is "2.00:00:00" (2 days). If it was changed, it might cause that your mail.que file grows unexpected. If you wish to reset that back to the default value run:

Set-TransportConfig -SafetyNetHoldTime 2.00:00:00

2.) Check the ShadowMessageAutoDiscardInterval. This parameter specifies how long a server retains discard events for shadow messages (as written here). A primary server queues discard events until queried by the shadow server. However, if the shadow server doesn´t query the primary server for the duration specified in this parameter, the primary server deletes the queued discard events.

Run the command below to check if your ShadowMessageAutoDiscardInterval was changed or is still on 2 days

Get-TransportConfig | select ShadowMessageAutoDiscardInterval

The default value here is "2.00:00:00" (2 days). If you wish to reset that back to the default value run:

Set-TransportConfig -ShadowMessageAutoDiscardInterval 2.00:00:00

3.) Another issues mentioned here which you should check when you troubleshoot space issues is the "PipelineTracingEnabled". The PipelineTracingEnabled parameter specifies whether to enable pipeline tracing (as mentioned here). Pipeline tracing captures message snapshot files that record the changes made to the message by each transport agent configured in the transport service on the server. Pipeline tracing creates verbose log files that accumulate quickly.

You can check the status via:

get-TransportServer -Identity exch01 | select PipelineTracingEnabled

If this is enabled you can disable it via:

set-TransportServer -Identity exch01 -PipelineTracingEnabled $false

 

Solution 1:

After the steps above are checked, which could cause this kind of issue, you can rebuild the mail.que via the following steps (preferred during a time frame where only low workload exists on the server)

1.) run the following powershell command:

Get-Queue

and make s note from the count of messages on the server

2.) Now goto services.msc and Pause (not stop!) the "Microsoft Exchange Transport" service or use powershell:

suspend-service -name "Microsoft Exchange Transport"

3.) run again the following powershell command:

Get-Queue

make sure that the queues are empty (the shadow redundancy queues might have some elements in it, that depends on your environment as written here).

4.) If the queues are empty (double check that to avoid losing emails) stop the "Microsoft Exchange Transport" service

stop-service -name "Microsoft Exchange Transport"

5.) Move all files inside the C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue folder into a backup folder (e.g. on another HD)

6.) Start the "Microsoft Exchange Transport" service

start-service -name "Microsoft Exchange Transport"

The Exchange server will rebuild the files now we moved from the queue folder

7.) run again the following powershell command:

Get-Queue

make sure that the queues & mail flow are working as expected.

Solution 2:

The 2nd solution to solve the growing disc space is to change the location of the queue database as explained here and put that on a drive which has enough disk space.

Solution 3:

As Exchange 2010 didn´t had the Exchange 2013/2016 feature called SafetyNet (more here) the default value from 2 days might be to high for your environment so you might start to try a smaller value, for example 1 day (instead 2 days which is the default value). SafetyNet is an improved version from the "Transport dumpster" from Exchange 2007/2010. In Exchange 2010, the transport dumpster helped protect against data loss by maintaining a queue of successfully delivered messages that hadn`t replicated to the passive mailbox database copies in the DAG. When a mailbox database or server failure required the promotion of an out-of-date copy of the mailbox database, the messages in the transport dumpster were automatically resubmitted to the new active copy of the mailbox database (as written here).

Set-TransportConfig -SafetyNetHoldTime 1.00:00:00

Currently you can change that only organization wide, there is no server setting!

If you do that you might see the following warning:

WARNING: Setting 'SafetyNetHoldTime' to a value lower than 'ReplayLagTime' in a Mailbox database copy can cause irrecoverable data loss. Please ensure that the 'SafetyNetHoldTime' parameter is set to a value equal or greater than the 'ReplayLagTime' parameter, which is set using the Set-MailboxDatabaseCopy cmdlet.

So keep also noted that you might wish to adjust the ReplayLagTime via Set-MailboxDatabaseCopy to 2 days as well:

Set-MailboxDatabaseCopy -Identity DB2\MBX1 -ReplayLagTime 2.0:0:0

 

Cross reference:
http://msexchangeguru.com/2011/06/02/mail-que/
https://social.technet.microsoft.com/Forums/exchange/en-US/8fe755e5-bbac-470a-8031-727f6d4d64c0/temp-and-mailque-growing-very-large?forum=exchangesvradmin

Comments (16)

Yaser
Yaser
  1. about 3 years ago
  2. #224
This comment was minimized by the moderator on the site

Thanks for the very useful information

  1. Reply
Sandro
Sandro
  1. about 2 years ago
  2. #407
This comment was minimized by the moderator on the site

thanks!

  1. Reply
Sandro
Sandro
  1. about 2 years ago
  2. #408
This comment was minimized by the moderator on the site

But if you have no free space on any disk for move full directory, you can just rename folder "Queue" and create new (stop services before)

  1. Reply
Bastian W.
Bastian W.    Sandro
  1. about 2 years ago
  2. #422
This comment was minimized by the moderator on the site

The only risk here is that you might lose emails if you aren´t that sure that its REALLY empty.

  1. Reply
Alex
Alex
  1. about 2 years ago
  2. #497
This comment was minimized by the moderator on the site

thanks a lot!

  1. Reply
Bastian W.
Bastian W.    Alex
  1. about 2 years ago
  2. #498
This comment was minimized by the moderator on the site

You are welcome

  1. Reply
Kaushik Patel
Kaushik Patel
  1. about 1 year ago
  2. #519
This comment was minimized by the moderator on the site

Hi,
Thanks for the resolution.
I followed the steps and and all the settings a you have mentioned however despite rebuilding the mail queue twice it keeps growing large.
We have the same setup on another mailbox server in the same environment...

Hi,
Thanks for the resolution.
I followed the steps and and all the settings a you have mentioned however despite rebuilding the mail queue twice it keeps growing large.
We have the same setup on another mailbox server in the same environment and that has the same config but the queue size is managing itself.

please advice if there are any other steps to follow or anything else that can be done to fix the issue.

Read More
  1. Reply
Bastian W.
Bastian W.    Kaushik Patel
  1. about 1 year ago
  2. #520
This comment was minimized by the moderator on the site

Hi, without knowing your environment in details its hard to predict something. For example it might be that the exchange server in charge is doing some heavily email routing with a lot of big files which caused that the file is growing much...

Hi, without knowing your environment in details its hard to predict something. For example it might be that the exchange server in charge is doing some heavily email routing with a lot of big files which caused that the file is growing much faster then the other one. It could be also that the server isn´t cleaning up older files which is causing a bigger growing mail queue (if that would be the case I would involve Microsoft). You also could fine tine the settings above so that it would fit your needs. For example a interval from 1 instead 2 days might be useful. It could be also a AntiSpam or AntiVirus Plugin which is causing that. But as said, if the server isn´t doing the cleaning on there own, i would get in contact with Microsoft as there might be something broken and without knowing the environment it wouln´t be really possible to give some advises.

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  1. Reply
Dag
Dag
  1. about 1 year ago
  2. #727
This comment was minimized by the moderator on the site

If you have a DAG, does the process of suspending the Transport Service and deleting the mail.que files need to be done concurrently on all DAG members at once? Is there a synchronization issue if this operation is only performed on 1 DAG member...

If you have a DAG, does the process of suspending the Transport Service and deleting the mail.que files need to be done concurrently on all DAG members at once? Is there a synchronization issue if this operation is only performed on 1 DAG member but not the other?

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  1. Reply
Bastian W.
Bastian W.    Dag
  1. about 1 year ago
  2. #728
This comment was minimized by the moderator on the site

Hi,

no you can perform that on each DAG member separately. You can switch the mailboxes to one member, then perform the mail.que task on the other one. Syncronisation issues might happen, it depends on your setup. For example if you use the DAG...

Hi,

no you can perform that on each DAG member separately. You can switch the mailboxes to one member, then perform the mail.que task on the other one. Syncronisation issues might happen, it depends on your setup. For example if you use the DAG and the Safety Net feature (see: https://docs.microsoft.com/en-us/exchange/mail-flow/transport-high-availability/safety-net?view=exchserver-2019) but mostly a DAG is only used for mailbox HA and not for mailflow HA.

Read More
  1. Reply
Leandro
Leandro
  1. about 1 year ago
  2. #759
This comment was minimized by the moderator on the site

Very useful, thanks!

  1. Reply
Bastian W.
Bastian W.    Leandro
  1. about 1 year ago
  2. #760
This comment was minimized by the moderator on the site

You are welcome

  1. Reply
Datuna
Datuna
  1. about 2 months ago
  2. #815
This comment was minimized by the moderator on the site

Hi,

very useful, thanks.

But for what reason we need to move this Mail.que?
Why not deleting?

  1. Reply
Bastian W.
Bastian W.    Datuna
  1. about 2 months ago
  2. #816
This comment was minimized by the moderator on the site

You "can" delete it, however you might need some elements out there at some time. The mail.que contains the Safety Net (Google "Safety Net in Exchange Server") and you "might" need it.

  1. Reply
Datuna
Datuna    Bastian W.
  1. about 2 months ago
  2. #817
This comment was minimized by the moderator on the site

Thank you for your answer,

Please can you explain more detailed about this.
For what reason may i need this?

  1. Reply
Bastian W.
Bastian W.    Datuna
  1. about 2 months ago
  2. #818
This comment was minimized by the moderator on the site

In Exchange the transport dumpster (now called Safety Net) helped protect against data loss by maintaining a queue of successfully delivered messages that hadn't replicated to the passive mailbox database copies in the database availability group...

In Exchange the transport dumpster (now called Safety Net) helped protect against data loss by maintaining a queue of successfully delivered messages that hadn't replicated to the passive mailbox database copies in the database availability group (DAG). When a mailbox database or server failure required the promotion of an out-of-date copy of the mailbox database, the messages in the transport dumpster were automatically resubmitted to the new active copy of the mailbox database.

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