Customers on our Residential Mail System will have an email address ending in either @roadrunner.com or @something.rr.com (e.g., @ca.rr.com, @austin.rr.com, etc.); no customers have an address ending in @rr.com, as that domain is reserved solely for role accounts.
The inbound hosts (MX records) for all Residential domains will be two of the following four hostnames:
The outbound mail servers for normal customer mail for our Residential Mail System are located in the following two networks:
Forwarded mail from our Residential Mail System (i.e., mail that's sent to a Road Runner customer mailbox but is then automatically forwarded out of our system to elsewhere) will come from the following IPs: