09-02-2020 02:50 AM - edited 09-02-2020 05:18 AM
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
09-02-2020 04:47 AM
@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=exchs...
To control cache of shared mail folders
09-02-2020 04:54 AM
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.
09-02-2020 05:05 AM
@Remco_Tiel You mean the .ost I assume. You can use the registry setting if applicable.
I found these on the topic
https://www.techpros.com.au/office-365-automapping-performance-issues/
09-02-2020 10:33 AM
SolutionIn 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.
09-02-2020 10:40 AM
thnx for the your answer. it is what it is so I'm done with it ;) and will only use send-as.