We are using MS Exchange 2007, just switched to TWC residential dynamic IPs.
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 smtp-server.DOMAIN.rr.com where "DOMAIN.rr.com" would be the same as the part after the @ sign of your email address. Some examples:
If your email address is firstname.lastname@example.org, your SMTP server is smtp-server.tampabay.rr.com.
If your email address is email@example.com, your SMTP server is smtp-server.austin.rr.com.
We now cannot get email our the door to some, not all recipients., even at the same .com address.
Any idea how we get Exchange to do the above?