Is it possible to assign an account with admin rights over a single domain in a multi-domain installation ?

Assume a zimbra installation with the following domains:
- domain1.com
- domain2.com

and the following users:
- admin: oerall zimbra server admin
- user1@domain1.com
- user2@domain2.com

Is it possible to give:
- user1@domain1.com administrative rights over the domain domain1.com (and not domain2.com) and the users in that domain ?

- and user2@domain.com administrative rights over the domain domain2.com (and not domain1.com) and the users in that domain ?

The 'account' page has a checkbox to give administrative rights to a user, but this gives the user full rights over the entire isntallation ?