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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/
Hello,
I solved it with the following solution, in Exchange in the Shared Mailbox, uncheck the "Hide from address books" option, wait about 5 minutes, close and open Outlook to reload the address list or force it to update in the Outlook menu, after that in send how to select From to choose the email directly from the address list (It may sometimes take a while for it to appear, but be calm, remember to remove what you had already saved from the list), after that try again, in my case it worked in time and before I was having the same problem.
I solved it with the following solution, in Exchange in the Shared Mailbox, uncheck the "Hide from address books" option, wait about 5 minutes, close and open Outlook to reload the address list or force it to update in the Outlook menu, after that in send how to select From to choose the email directly from the address list (It may sometimes take a while for it to appear, but be calm, remember to remove what you had already saved from the list), after that try again, in my case it worked in time and before I was having the same problem.