I have users in three different Organizational Units (OU's). Users in each OU receive mail from a different SMTP domain name. I want to configure exchange recipient policies in order to automatically set different e-mail addresses to users in different OU's. If I specify OU's in the query selector, the policy would be applied only to the OU but not to the users belonging to that OU. If I specify users, I don't know how to filter the ones that belong to a specific OU. Althoung the users belong to a specific OU, the "ou" field in AD is not set, so I can't do an LDAP query such as "(&(objectCategory=person)(objectSid=*)(ou=my-ou-name))" Does anybody know how to write an exchange LDAP query that matches all the users under a specific OU? Thanks in advance