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close open relay Exchange 2003 server

Hello,
I have the following situation: we have a Exchange 2003 server which we want to relay internally for all unix, linux servers, but we don't want that the users to send forged emails to the internet using this server.
Is there a posibility to achieve this?

Thank you,
Dan

Mestha

Do you mean internal users or external users?

Exchange allows relaying by either authentication or IP address. Authentication is the best option as it allows you to restrict who can use your server.
If you must use IP addresses then set it to specific ones rather than a subnet.

-M

4nd7

ASKER

I mean internal users, who may try to forge their addresses and send emails to the internet. Can I use the same server with 2 smtp virtual servers? One that requires authentication and the other open for relay?

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Hypercat (Deb)

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4nd7

ASKER

So in my case(I have alot of devices which cannot authenticate UPS,unix,linux) the best solution woluld be to only allow relay from specific IP addresses, right?
Wouldn't be possible to have 2 SMTP Virtual servers on the same Exchange server, each with a different IP address, and to allow unauthenticated users and all IP addresses to relay through one of the virtual smtp server, and to configure the IP of another in the address of the local bridgehead of the outbound connector?

Thank you,
Dan

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Mestha

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