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How do I point outgoing email from exchange through a nonexchange box with separate IP address

I am running Exchange 2003 with a Front end and Back end server, all of which is behind a firewall which nat's to the outside.  We would like to test an antispam solution which basically is a separate non-exchange box, also behind the firewall.  Is there a way to point my outgoing email from exchange through this IP address.  As my exchange servers have traditionall talked directly with any external email servers (through the firewall), I am now not sure how to implement this.  The purpose of this is to allow the antispam solution the ability to whitelist/autoadd outgoing email addresses so that they aren't caught on the way back.
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haselld
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haselld
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Vishal BreedProgram ManagerCommented:
Create SMTP connector & add that Box's IP as Smart Host. 25 port of that port must be open.
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Vishal BreedProgram ManagerCommented:
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Network_Data_SupportCommented:
yes just edit the smtp conector from dns to smart host and put the ip address inside [] or use a FQDN
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Vishal BreedProgram ManagerCommented:
correct.
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Vishal BreedProgram ManagerCommented:
Use IP address; because if DNS server (must be AD DNS) is down - outgoing mail will stop!!
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