I have 2 sender, User A send a meeting request to 3 Users (B,C,D). She will received bouncing message as below:
IMCEAEX-_O=Contoso_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=UserD@contoso.com #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
UserD is resigned and his AD doesn't exist anymore.
I did checked the delegation of Sender,User A and Users (B,C,D). Outlook delegation is empty (not grey out).
I did used MCFMAPI, there is no "Schedule+EMS Interface" for Sender A, User D. There us "Schedule+EMS Interface" for User B,C.
I did sent a test meeting to User B,C but not received any NDR.
I know this is related to orphan delegate. I'm facing same issue previous but previous i managed to removed the non-exisitng user at Delegate using Outlook and MAPI.
But this time there is no delegate exist, it is clear.
Please advice next action.