[Dovecot] Power user

Hi all,

I am very new to dovecot and I would like to know if there is a way to configure a user with all the read/write right on all mailbox.

I would like to have a power user (PowerUser) able to reach USER1 mailbox using the following login PowerUser@domain/USER1@domain and the password will be the PowerUser password.

Thanks for help,

Alexis