Changes ISP and MS Eschange 2007 sends get bounced

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 joe@tampabay.rr.com, your SMTP server is smtp-server.tampabay.rr.com.

    If your email address is sally@austin.rr.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?
Gerry PoeCEOAsked:
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Gerry PoeCEOAuthor Commented:
Creating a reverse DNS zone seems to have resolved the issue.
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Gerry PoeCEOAuthor Commented:
Apparently the fix is not good.

Still getting: The following organization rejected your message: s12p02m013.mxlogic.net.

SO still need to know how to resolve the issue...
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Gerry PoeCEOAuthor Commented:
More data:
SNT004-MC3F47.hotmail.com #550 DY-001 (SNT004-MC3F47) Unfortunately, messages from "IP_ADDRESS" weren't sent. Please contact your Internet service provider. You can tell them that Hotmail does not relay dynamically-assigned IP ranges. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. ##

Seems like Exchange cannot use a "proxy" send?
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Gerry PoeCEOAuthor Commented:
http://exchange.sembee.info/2010/hub/send-connector.asp

May have resolved.. creating a new send connector.
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Gerry PoeCEOAuthor Commented:
Nope. not it either..
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