[Exim] Router for dnslookup-based sender verification

Hi,

I'm considering the following dnslookup-based
router for sender address verification:

sender_dnslookup:
        driver = dnslookup
        domains = ! +local_domains
        verify_only = true
        verify_sender = true
        verify_recipient = false
        ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
        self = send
        no_more

Is it "correct"? Any suggestions?

Thanks,
Everton