Reinhard,
I put the following ACL in my exim4 configure file which stops this
relay attempt:
deny local_parts = ^.*[@%!/|]
message = Invalid characters in local_part of recipient address
There's a mail relay tester at
www.abuse.net/relay.html which I use
whenever I change the configure file just in case I break something.
You need to register to run the full tests but it's free and quick.
Hope this helps.
Glenn
At 3:04pm +0000 23/7/02, Reinhard Travnicek wrote:
>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
>
>
>
>------------------------------------------------------------------
> This email was checked by AMaViS anti-virus system !
> Get yourself a free email address at http://mail.serverart.org
>
>
>--
>
>## List details at http://www.exim.org/mailman/listinfo/exim-users
>Exim details at http://www.exim.org/ ##
