(&
    (&
        (&
            (&
                (mailnickname=*)
                (|
                    (&
                        (objectCategory=person)
                        (objectClass=user)
                        (!
                            (homeMDB=*)
                        )
                        (!
                            (msExchHomeServerName=*)
                        )
                    )
                    (&
                        (objectCategory=person)
                        (objectClass=user)
                        (|
                            (homeMDB=*)
                            (msExchHomeServerName=*)
                        )
                    )
                    (&
                        (objectCategory=person)
                        (objectClass=contact)
                    )
                    (objectCategory=group)
                    (objectCategory=publicFolder)
                    (objectCategory=msExchDynamicDistributionList)
                )
            )
        )
        (objectCategory=contact)
        (proxyAddresses=smtp:*example.com)
    )
)