In Exchange 2010/2016, you might come across a strange error as shown below when sending email:
Failed to process message due to a permanent exception with message Invalid named property
![Exchange 2010/2016:- failed sending mail, #554 5.2.0 storedrv Exchange 2010/2016:- failed sending mail, #554 5.2.0 storedrv](https://www.collaborationpro.com/wp-content/uploads/2020/04/image.png?fit=1024%2C316&ssl=1.webp)
Solution:
To fix this problem, you need to move the mailbox to another store with a specific switch:
- New-MoveRequest “User” -DoNotPreserveMailboxSignature -TargetDatabase Store1
![Exchange 2010/2016:- failed sending mail, #554 5.2.0 storedrv Exchange 2010/2016:- failed sending mail, #554 5.2.0 storedrv](https://www.collaborationpro.com/wp-content/uploads/2020/04/image-1.png.webp)
Once the move has completed, you should no longer receive the delivery error above.
Hope it helps.