I think it may be time to re-visit this!
I am aware of the reasoning behind and for the setup of the admin account and resultant admin@ email address and system messages, however, I am constantly having to work around it to provide the company receptionist with the admin@ email address. I note I am not alone in doing that.
As much as I would like to change the view of organisations to not use admin@ as a general email address, they generally have been doing it for years and oft have it printed on stationery.
Might I suggest that the 'admin' becomes 'sysadmin' and an admin@ pseudonym is allowed out of the box.
Klaus