How can I configure dovecot to authenticate users against my OpenLDAP server with Red Hat Enterprise Linux 5?

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Assume that OpenLDAP server is running on the same machine with dovecot and the LDAP directives are configured as below:

suffix "dc=example,dc=com"
rootdn "cn=Manager,dc=example,dc=com"
rootpw redhat

And user redhat with password redhatpwd has been added into OpenLDAP server. All the users are under the subtree "ou=People...

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