Hi Shizuka,
For role-specific tasks the best way is to arrange a functional account over an personal-bound one.
Transfer the ownership of the sheet to this functional account and have the admin grant additional rights for mail or storage quota and such.
You get to manage both your own/personal and the functional account.
This way you can not only separate your own business communication from the functional part, making your own inbox way less crowded, but the transfer of the role - or the sharing with a peer - becomes a whole lot easier :)
Cheers, Bart