Setting up Exchange to just be a SMTP server

We have recently outsourced out email to on Internet Service provider.
We connect with HTTP over RPC to the exchange server.

We have some applications that need to relay email via SMTP.
The ISP does not have a SMTP server for us to relay through.

How can I setup our old exchange 2003 to be used as just a SMTP server, that does not require authentication to relay emails?
Barry KaySystems EngineerAsked:
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If you want that certain applications should be able to relay through your Exchange Server then you would need to add that server's IP address into the Default SMTP Virtual Server>Access>Relay>Add the IP into the list and then that all you would need to do from the Exchange server perspective.
Just use it as you did before the outsorcing. Add your internal IP addresses to the virtual SMTP server (Properties->Access tab->Relay restrictions). Then you won't need to authenticate
Barry KaySystems EngineerAuthor Commented:
Where do I find the virtual SMTP server?

Let me also elaborate on the problem here.
We had our email addresses as (lets call it) on a local exchange server that is intergarted into our domain. We have now moved the email hosting offsite to an internet service provider.
I have removed all mailboxed from the local exchange server, but I think it set to think that the email addresses are controlled by that exchange server. I have tried sending a test mail to an address in and relay it via the exchange server, but it comes back failed.

I need to configure exchange to only be an SMTP server.
Barry KaySystems EngineerAuthor Commented:
Found another Solution

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