1) how do we configure SMTP gateway in organization. can u give some examples.
do we require mx records for outgoing mail, if yes then why?
2) in Exchange 2013, does CAS has RPC client access service as it just proxies connection to mailbox server. so if exchange 2013 CAS doesn't have RPC IN CAS , THEN AUTODISCOVER ON CAS 2013 is through HTTPS for virual directory which let client connect to exchange?