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SMTP Relay

By a_tank ·
I have inherited an email system that I am having trouble with. They have Exchange 5.5 set up on there LAN. All mail is forwrded to an SMTP server, running IIS 4.0, that sits outside of there LAN which is used to forward messages for the Exchange server. I am now receiving emails saying that this machine is forwarding Spam. Sure enough, the Mailroot\Queue is full of junk mail. As I am unfamiliar with IIS, how can I restrict this from happening. The IIS machine has the latest service packs. The Eschange Server does to, although the machine itself has only service pack 5. Any help appreciated.

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SMTP Relay

by VinnyD In reply to SMTP Relay

your exchange server is being used as an open relay.

To test to see if it is you can go to this web site.

http://ordb.org

You submit your exchange server IP address and they will check it for you.

Here is a web site with instructions on how to stop the relay.

http://rr.sans.org/email/open_relay.php

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SMTP Relay

by a_tank In reply to SMTP Relay

The question was auto-closed by TechRepublic

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SMTP Relay

by [_Rick_> In reply to SMTP Relay

Remove the IIS Server with the SMTP gateway and install an Exchange 5.5 server with the IMS Connector. (If you already have one - you can install another in a different site).

The Exchange server can then be configured to restrict any relaying except from the Internal system.

If you don't want to use Exchange, then I recommend using a firewall which has SMTP relaying capabilities built-in or use a SENDMAIL product (either for Linux/Unix or for NT). These will provide you with better security and be more robust than the SMTP gateway found in the IIS environment.

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SMTP Relay

by a_tank In reply to SMTP Relay

The question was auto-closed by TechRepublic

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by a_tank In reply to SMTP Relay

This question was auto closed due to inactivity

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