On Tue, 23 Jul 2002, 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
What the sender is shouldnt matter to your relay checks. Only the remote
IP should matter, unless SMTP AUTH was accepted..
> user%otherdom.com@??? the mail is forwarded to the internal server.
Ok, so your exim machine cant verify recipients and see that
"user%otherdom.com" isnt a valid user at your site.. It is optimal if it
can do so..
> The internal server (not doing any relay checking at all) just sends the
> mail out to user%otherdom.com with a sender relaytest@???
If possible, tell the other server not to recognize "%" as special, so
instead of stripping off @yourdomain.com, and turning the "%" into "%",
it just tryies to look for "user%otherdom.com" as a user (and find it
nonexistant and fail the message.
If that is not possible, and you are using exim4, you could use an ACL
to reject and recipient address with a "%" in it..
>
> 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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