Rerouting Mail on the LAN

The scenario is a small home office, 1 domain controller windows server 2003 and running exchange 2003. 1 workstation using outlook to connect to exchange. Network connectivity is via Virgin Media (VM) Cable Broadband modem and a DLink Router. The external address is allocated by VM using DHCP. In the last few months the numbers of outgoing mail being bounced has increased massively because the external IP address is on DUN lists and there seems to be an increase in the number of Mail Admins who automatically ban SMTP from DUN as spam. Incoming mail is handled using DYNDNS.

Also available is an ADSL connection with a fixed IP address. Is it possible to add an NIC to the domain controller and configure exchange to use this connection to send and receive mail via the ADSL while leaving other internet activity on the DC and the workstation over the Cable connection as it is much faster?

If so it is beyond me and I would welcome advice on how to set it up.
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cescentmanAsked:
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DMTechGrooupCommented:
Not sure where you are located but a lot of companies ban any dynamic IP address.. Your best bet is to use a 3rd party SMTP service like DNS Made Easy or Google.

http://www.dnsmadeeasy.com/s0306/prod/smtp.html

http://www.geekzone.co.nz/tonyhughes/599
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bevhostCommented:
You should send all your mail out via your ISP server from exchange.
All your local PC's can send via exchange

Click the advanced button on the delivery tab in the SMTP Virtual Server Properties.

Set the smart host to the mail server of your ISP.
advanced-properties.jpg
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DMTechGrooupCommented:
Some ISP's (Like Qwest) don't have SMTP servers available as they use the MSN package.  
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bevhostCommented:
Failling that, you can organise a fixed IP address and make sure  that you have your ISP Set the PTR (reverse DNS) to match the Fully Qualified Domain Name in Advanced Delivery Options above.  You must also have a A record (forward DNS LOOKUP) in your DNS that match the reverse one.  You may also want to set an MX record to your A record for incoming SMTP.
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bevhostCommented:
if you do setup the fixed IP address and DNS entries you can test your setup here http://tools.bevhost.com/spf
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cescentmanAuthor Commented:
Thanks for the comments and help. I have had to focus on another task for the moment. I will get back and work this next week.
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cescentmanAuthor Commented:
Just to say life has been so busy I'm just putting up with this at the moment but will return to it at some point. Sorry for the delay.
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cescentmanAuthor Commented:
I haven't forgotten this and will get back to it. Sorry I have had to delay progressing it.
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cescentmanAuthor Commented:
Sorry it took so long to finish off.
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