I admit this has been in my "If you don't look at it funny, it will not mess with you" category. However after having some interesting conversations at Ignite last week I decided to go back and look at this.
Occasionally I have a user that reports the "IMCEAEX" NDR. I have always had them delete their address autofill cache and the issue was resolved. Our mailboxes have X.400 addresses assigned. They have been there since I took over the environment. There are no X.500 addresses.
I ran the following to see if there are issues I was not aware of:
Get-TransportServer | Get-MessageTrackinglog -EventID FAIL -Start (Get-Date).AddDays(-7) -ResultSize Unlimited | Where {$_.Recipients -match "^IMCEAEX*"}
This returned a large number of results.
My question is, do I need x.400 addresses? Should they be x.500? Would removing the x.400 resolve these NDRs or possibly make it worse?
brian smith