No, it’s not possible unless you have their passwords.
From my moonlighting jobs and previous jobs I usually include myself in the SysAdmin or IT email groups or distribution lists. I received a good one yesterday (translated from Malay):
Dear IT, Need your help to delete 3 emails sent by John Doe to 3 recipients below because we sent the wrong email to the client. |
There are different headaches in maintaining email servers, for example one might complain of too many spams but sometimes “valid” emails gets filtered. But this one really made my day.