Mailboxes are keep getting quarantined

Question

_{Tuesday, May 7, 2019 11:43 AM}

Hi,

I have Exchange 2016 and I am having an issue with few users whose mailboxes are getting quarantined repeatedly. Following are the methods I tried to resolve this issue but none of them worked for me. User count is getting increased day by day. Could anyone please advise me on this? Can this be due to client issue?

1. Disable-MailboxQuarantine "UserName"

2. Deleted the registry key in below path.

HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ServerName>\Private-{dbguid}\QuarantinedMailboxes\mailbox guid}

3. Removed AV application from Exchange server.

Regards,

Thisaru Perera.

All replies (5)

_{Wednesday, May 8, 2019 2:41 AM}

Hi Thisaru,

1.Is there any commonality on the problematic user mailboxes? For example, they all in the same mailbox database.

2.Any related error/warning on event log?

The store is to crash or get hung up on a single thread and exceed the limitation (3 times in 2 hours), that mailbox will be quarantined for 24 hours. Quarantining of mailboxes can occur in two situations:

    1. A thread that is doing work for a mailbox has crashed.

    2. More than 5 threads allocated to process a mailbox, have not progressed for a long time.

Verify whether the mailbox is in quarantine state or not, please run the commands below:

Get-MailboxStatistics Administrator | Select DisplayName, IsQuarantined | Format-Table -AutoSize

If the IsQuarantined is true, the Exchange Mailbox is poisoned, you could run New-MailboxRepairRequest to detect and fix mailbox corruptions, then monitor the result. 

New-MailboxRepairRequest -Mailbox <Identity> -CorruptionType ProvisionedFolder,SearchFolder,AggregateCounts,Folderview -Archive

The problem also might be with some kind of corruption in the databases. You could create a new database and move the users to this database and check the results.

Regards,

Kelvin Deng

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_{Monday, May 13, 2019 8:07 AM}

Hi Thisaru,

I'm just writing to check how's everything going? If you have any questions or needed further help on this issue, please feel free to post back. If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.

Best Regards,
Niko Cheng
Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact [email protected].

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_{Monday, May 13, 2019 3:41 PM}

Hi Kelvin,

Apologies for the delay.

There's no commonality on the problem. Because there is at least one quarantined user from the each database.

I have created new DBs and moved unaffected users there. But still mailboxes are getting quarantined.

Can this be due to malware or virus?

Regards,

Thisaru Perera.

_{Sunday, May 19, 2019 6:14 AM}

Hi Thisaru,

I suggest you check if there is any 3rd party add-ins or filtering software install on the server, please try to disable them and check the email again. 

Meanwhile, you could also refer to the following articles for the ways to find the reason:

Mailbox quarantining in Exchange 2010 and Exchange 2013

Know How to Repair Exchange 2013 Mailbox Keeps Getting Quarantined Issue?

(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. )

Regards,

Kelvin Deng

Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact [email protected].

Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

_{Wednesday, May 22, 2019 8:18 AM}

Hi Thisaru,

Just checking in to see if above information was helpful.

If you have solved your problem, please don't forget to mark it as answer. This may help more people with similar 
problems. Thanks for your understanding.
 
Regards,
Kelvin Deng

Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact [email protected].

Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.