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I'm in the process of performing a migration to Office 365. I have set up a mailbox and need to grant "Send on Behalf of" permissions to this mailbox for 2 users. I ran the following command in PowerShell:
Set-Mailbox <MAILBOX> -GrantSendOnBehalfOfTo <USER MAILBOX>
When I run Get-Mailbox <MAILBOX> | fl GrantSendOnBehalfTo I can see that the permission has been granted however when I try to send an e-mail as this mailbox it bounces straight back with the following error:
You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission.
Please could someone advise as to why this is not working?
Based on your description, since you have run the PowerShell command: Get-Mailbox <MAILBOX> | fl GrantSendOnBehalfTo and checked the permission has been granted successfully, I would like to confirm if this issue happens on Outlook Web App or Outlook desktop.
If it could not work on Outlook desktop, please try to send as this user in OWA and see if it helps.
Sometimes, it may need a long time for the permissions to be populated.
1 out of 1 people found this post helpful.
Thanks for your post. setup the "sendas" (SendOnBehalfTo) permission for this case.
Add-RecipientPermission firstname.lastname@example.org -AccessRights SendAs -Trustee email@example.com Detail information : help.outlook.com/.../ff852815.aspx
Thanks, Neo Zhu
Thanks Neo but why can't I configure "Send On Behalf Of" permissions as originally intended?
I'm writing in just want to ensure that all the information Anna provided is useful for you.
Thanks for your reply - for some reason it does work via OWA but not when I use Outlook 2010.
It could be sync issue of offline address book. You can try to remove the local OAB file and re-download again.
It seems to be working now, perhaps it just took a day or so for the permissions to take effect.
Thanks to all who responded.