Exchange Server Relay through external VPS

We have a Microsoft SBS 2003 server with exchange setup and working on it. But we have an issue with NDR's because we are using a home internet service called clearwire we do have a static ip through them. But can't get them to add our domain to there dns or use there smtp relay because they are now using google apps. Our website is hosted on an external vps and has the MX records set on that server to send mail to our clearwire dedicated ip. I'm trying to reconfigure the exchange box so no more ndrs. I'm thinking I use the VPS the go between but not sure just what would be the best way to set this up. I've tried googling for a solution but haven't found anything. Hoping someone out there has ran into this same issue and had a solution. Thanks
USBMHCAsked:
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simprixConnect With a Mentor Commented:
You can set exchange to forward to a relay host (smarthost)

http://www.dnsexit.com/support/mailrelay/exchange/setup.htm

Also I would make sure the reverse DNS for mail is point to the vps.
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USBMHCAuthor Commented:
ok so if i use those instructions but put in my vps. and then setup the reverse dns back to the vps how do I set the vps to send the mail back
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USBMHCAuthor Commented:
so after a little more digging i found my vps is running exim. I also found articles talking about doing a mailhub and smtp using exim. But I haven't found anything really telling me the proper way to set this up.
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USBMHCAuthor Commented:
ok got it setup now so it sends email to my exchange server by following this
You should be able to achive this by adding this on top of the ROUTERS CONFIGURATION in Exim's config file:
Code:

smart_host_your_client:
  driver = manualroute
  route_list = your_client's_domain.com 123.123.123.123
  transport = remote_smtp

This should forward all mail addressed to your_client's_domain.com to the IP address 123.123.123.123 (which should be the address of the machine running your client's Exchange).

Now I just need to setup the exchange server to send mail through the exim on my vps out.
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