Smtpd (one of the mentioned daemons) is started in a default install. It is configured to do local mail delivery and can queue up remote deliveries for programs running on the system. It only connects to localhost and does not authenticate so this exploit would be irrelevant. If one did open an authenticated mail connection on an interface accessible to the world then the exploit would allow the system to be used as a spam relay.

Added: Just to be clear, this doesn't give any significant access to the system itself through smtpd even if it is configured to be remotely accessible. So not a possible remote hole. Dunno about other stuff.