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Road Runner Mail Blocks

General questions regarding Road Runner's spam blocks or blocking policies can be directed to

In December 2003, Road Runner instituted a policy that prohibits direct connections to its inbound mail servers from its residential dynamic space. If you're a Road Runner customer attempting to send email, and you're receiving an error message that looks like any of the following:

ERROR:5.7.1:550 Mail Refused - - See
ERROR:5.7.1:550 Mail Refused - - See
ERROR:5.7.1:550 Mail Refused - NETWORK_NUMBER - See
ERROR:5.7.1:550 Mail Refused - IP_ADDRESS - See

then you're in Road Runner dynamic space.

Your options to rectify this situation are as follows:

  • If you are a Residential customer, reconfigure your computer or mail client to relay all email through the appropriate local Road Runner outbound SMTP server. The hostname for that server is where "" would be the same as the part after the @ sign of your email address. Some examples:

    If your email address is, your SMTP server is

    If your email address is, your SMTP server is

  • And so forth...

  • If you believe that you are a Business Class or Static customer who requires the ability to run your own mail server, then contact your local cable division. You have either been incorrectly provisioned in space that is reserved for residential customers, or the space you're in needs to be re-designated as non-Residential space, or you're a Residential customer who may need to upgrade to a different tier of service.