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:

• hrndva-smtpin01.mail.rr.com
• hrndva-smtpin02.mail.rr.com
• cdptpa-smtpin01.mail.rr.com
• cdptpa-smtpin02.mail.rr.com

The outbound mail servers for normal customer mail for our Residential Mail System are located in the following two networks:

• 71.74.56.120/29
• 75.180.132.120/29

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:

• 71.74.56.23
• 75.180.132.34