DL permissions- Send As and Send on Behalf permission

Question

Hi Experts

i am using exchange 2016 hybrid environment. we create users in exchange onprem and migrate to cloud. i have onprem DL, lets say onpremdl@Company portal .com
i want to give Send As and Send on Behalf permission to this DL for one user lets say user1@Company portal .com. From GUI i am unable to give the permission.
Will the below powershell syntax help me adding it

Add-RecipientPermission onpremdl@Company portal .com -AccessRights SendAs -Trustee "user1@Company portal .com"
Set-DistributionGroup -Identity "onpremdl@Company portal .com" -GrantSendOnBehalfTo "user1@Company portal .com"

Answer 1

@Rising Flight

When the Send As permission exists, the Send on Behalf permission will not work, so you just need to add the send as permission.

About send as permission, you need to add from both Exchange online and Exchange on-premises:

Run the following command in the Exchange Management Shell on your on-premises Exchange server:

Add-ADPermission -Identity EXO1 -User ONPREM1 -AccessRights ExtendedRight -ExtendedRights "Send As"  

Then run the corresponding command in Exchange Online PowerShell:

Add-RecipientPermission -Identity EXO1 -Trustee ONPREM1 -AccessRights SendAs  

For more detailed information, you could have a look about this article: Mailbox permissions and capabilities NOT supported in hybrid environments

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