General InformationServers and NetworksBusiness Class Mail System Servers

Business Class Mail System Servers


Time Warner Cable offers a Business Class Mail hosting product that is supported by Time Warner Cable Messaging Operations. This product hosts mail for many small businesses that want an Internet presence identified by their own domain.

Domains hosted on this system will all have the following MX records:

  • mx1.biz.rr.com
  • mx2.biz.rr.com

Outbound mail from this system will come from the following IP range:

  • 75.180.133.32/31

Forwarded mail (i.e., mail sent inbound to a mailbox in a domain hosted on these servers and immediately forwarded to a remote domain) will come from this IP address:

  • 75.180.133.42