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Mailboxes into Quarantine after migrating to Exchange 2019

After migrating mailboxes to exchange 2019 from exchange 2016 . Most of the mailboxes went to quarantine all of a sudden and databases went to dismount state and came back to mount state. We couldn’t bring the databases to a stable state. We realized its a bug in exchange 2019. Initially that it was a refs formatted disk was playing around we were wrong. Still I couldn’t believe this was the fix for the crazy issue.

Get-TransportConfig | fl *size*

You can check maxsendsize and maxreceivesize should not be unlimited. Set to 35 mb for example. It works seamlessly after that . Don’t ask me why. But it works like a charm.

Set-TransportConfig -MaxReceiveSize 35MB -MaxSendSize 35MB

Good to Have –

To Take out a mailbox from Quarantine –

Disable-MailboxQuarantine "Mailbox Name"

To place a mailbox in Quarantine –

Enable-MailboxQuarantine "Mailbox Name"

To check mailboxes which are in quarantine in a database

Get-Mailbox -Database "DBName" | Get-MailboxStatistics | Where {$_.IsQuarantine -eq $True}
Satheshwaran Manoharanhttps://www.azure365pro.com
Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Azure365pro.com. Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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