I tried to find a way to see which User are missing a mailbox.
We configured some domains which will be scanned by Sophos.
Now we get on some email addresses the error code "550 5.7.1 Command rejected" in our exchange.
Which often means that there is mailbox in Sophos Central.
Is there a way to see in the logging or in a report which email are rejected because the mailbox does not exist.
Thanks for your help.