Hello, folk.

Really tired to search Google for a two days. Need an assistance.
I have fresh installation of Zimbra 7.2.0 on CentOS 6.

On installation step I set domain example.com (name is changed). So now I login as admin@example.com both to mailbox and admin panel and everything seems to be working.
But I have external LDAP (Oracle DSEE7) which contains all the example.com users. Ant I set domain authentication to External LDAP. On wizard's step I tested my own user and test were successful.

But when I logout from admin@example.com mailbox dashboard and try to login michael.a@example.com (my user) the LDAP query goes not to external LDAP but to Zimbra's LDAP. And of cause query returns no user. Login failed.

Two questions:
1) How can I switch query to external LDAP?
2) If I switch successfully, how will I login under no corporate user admin@example.com with admin privileges?