I suspect the admin had the best of intentions at the time. There was a time email was newish and he probably thought he was helping people out by fixing typoed email. I doubt he was thinking it would be a problem getting work related emails and sending them on their way.
Me? I'd nuke it and then consider if I want a catch-all anymore. Maybe just check the mail logs and add some alias for some common problems. It is easy to be the armchair general with hindsight though.