Office365 migration-Cannot remove remote user mailbox message size restriction

Question

We are migrating from Exchange 2010 to Office365. We migrated a mailbox that is now in the cloud, but we cannot send him a larger attachment because his remote mail user contact shows a 5GB limit. The setting is greyed-out and not seeing a way to change it. The O365 mailbox does not show that restriction, but does anyone have any ideas on how to remove a greyed-out message size restriction on a remote user mailbox?

Answer 1

You can view with on-prem Exchange Powershell get-remotemailbox to confirm:

Get-RemoteMailbox <user>  |FL *max*  

If there is a value there, clear via adsiedit.msc

MaxReceiveSize in Exchange = delivContLength in AD

MaxSendSize in Exchange = submissionContLength in AD

Answer 2

Hi @Dave Bryan ,

Agree with the suggestion from Andy, you could also use the command below to clear the values

set-ADUser -Identity user -clear submissionContLength  
set-ADUser -Identity user -clear delivContLength  

---

If an Answer is helpful, please click "Accept Answer" and upvote it.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.