[Exim] Exim a Open Relay ?

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Author: Reinhard Travnicek
Date:  
To: exim-users
Subject: [Exim] Exim a Open Relay ?
Hello !

I am using a server with exim as a firewall front end.
Exim is configured to accept mail only for mydomain.com
All the mails matching @mydomain.com are then handed to a internal mail
server.

Unfortunately someone figured out the exim doesn't handle
Email to: user%otherdom.com@??? correct

If the sender is faked to relaytest@??? and the receipient is
user%otherdom.com@??? the mail is forwarded to the internal server.

The internal server (not doing any relay checking at all) just sends the
mail out to user%otherdom.com with a sender relaytest@???

Is there a way ? Maybe a filter to stop a message already on the Exim ?

TX for your help

Regards

--
Reinhard Travnicek
Tech. Manager
X-tech Austria



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