Command Line.To delete store administrators at the command line, you can edit the administrator list as follows:
configutil -o store.admins -v "adminlist"
where adminlist is a space-separated list of administrator IDs. If you specify more than one administrator, you must enclose the list in quotes. In addition, the administrator must be a member of the Service Administrator Group (in the LDAP user entry: memberOf: cn=Service Administrators,ou=Groups,o=usergroup).
You must restart imapd for the system to recognize the change in store.admins.