Forum Discussion
Send on Behalf not working in specific situation
We've a hybrid exchange 2013 and Exchange online environment where all mailboxes are migrated to the cloud. I've set Send-On-Behalf permissions correctly but it doesn't work if you add the profile in Outlook in a specific way.
send-on-behalf works:
In Outlook365 go to File>Account Settings>Account Settings>select your email address>change>more settings>tab advanced> add the mailbox with the send-on-behalf permission
send-on-behalf does not work:
In Outlook365 go to File>Info>Add Account>follow the wizard
Is it not possible to send-on-behalf in the second situation?
We've chozen for the second option because we've a lot of shared mailboxes, if you add them to your profile a seperate ost file is created instead it is added to your own ost file which could cause performance issues on growth.
Regards Remco
In the second scenario, Outlook is effectively using Send As permissions, so just add those and be done with it 🙂 If you insist on using Send on behalf of, you need to make sure to always select the "send using" dropdown, as detailed in the article linked above.
5 Replies
In the second scenario, Outlook is effectively using Send As permissions, so just add those and be done with it 🙂 If you insist on using Send on behalf of, you need to make sure to always select the "send using" dropdown, as detailed in the article linked above.
thnx for the your answer. it is what it is so I'm done with it 😉 and will only use send-as.
Remco_Tiel Hi, you're doing it manually? You really benefit by using PowerShell
https://docs.microsoft.com/en-us/powershell/module/exchange/add-mailboxpermission?view=exchange-ps with the -AutoMapping switch.
To answer your question https://docs.microsoft.com/en-us/exchange/collaboration/shared-mailboxes/shared-mailboxes?view=exchserver-2019#what-are-shared-mailboxes
To control cache of shared mail folders
https://support.microsoft.com/en-us/help/982697/by-default-shared-mail-folders-are-downloaded-in-cached-mode-in-outloo
Thnx for your reply. I've tested the automapping, which works, however automapping is adding the shared mailbox to your own profile (pst) instead of creating a seperat pst file.
Remco_Tiel You mean the .ost I assume. You can use the registry setting if applicable.
I found these on the topic
https://www.michev.info/Blog/Post/2025/how-to-add-a-shared-mailbox-as-additional-account-in-outlook-2016-build-8431-and-above-on-windows-10-1709-and-above
https://www.techpros.com.au/office-365-automapping-performance-issues/
