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Shared mailbox: Use send-as, not send on behalf from Outlook 2016
Hello,
We have a lot of shared mailboxes. For every shared mailbox, we create a specific security group that contains the members who should have access to that particular shared mailbox.
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The behavior depends on how you've added the shared mailbox in Outlook (automapped vs additional account), and of course by the method you use to compose the message. Check my ramblings on the topic here: https://www.michev.info/Blog/Post/1430/
When choosing the From address using the Global Address List instead of the offline one, I'm now able to send-as. :)
Thanks for the help
Many years later, came to say this worked for me also.