Nov 17 2022 12:43 PM
Hi all,
wondering whether you may help me to understand the behavior that I experience recently with new shared mailbox in O365 created recently...
I have never had problem to create shared mailbox in Exchange Online before... However, recently I had to create a new shared mailbox and assign full access & send as permission for few users. Strangely, when those users tried to send email from that mailbox, they received the error - picture attached
The mailbox is set up the same way as all my shared mailboxes in the past... It looks like any that I create recently (last two weeks) it is behaving the same. Also, I can see that Outlook is trying to send the emails like "sent on behalf" which is strange as "sent on behalf" is not set for the users.
PS: I created a shared mailbox 2 weeks ago and ended up to make it standard user mailbox and adding it manually to outlook for required users... I thought there was just something "strange" going on with that mailbox.... but today I had to create another one and it is the same.
PS2: all shared mailboxes that were created in the past do not have any issue and work fine...
Nov 18 2022 12:12 AM
Nov 18 2022 12:35 AM - edited Nov 18 2022 12:36 AM
Hi Vasil,
I will create a testing shared mailbox to play with it... Email is sent to external recipient, yes. I do not believe it is mail flow or similar as that would affect all maliboxes.... however... as I mentioned... all mailboxes (even shared ones) are working fine... Except the shared ones that were creating recetly.
I've found a topic a guy described the same situation ... and looks like with MS tech support they got it fixed by removing permissions / re-adding permission / disabling automap (all these via PowerShell) and manually adding shared mailbox in Outlook....
So I will try that as well... However, still wondering why this is happening :\
Nov 25 2022 12:20 AM