[Exim] Exim - open relay ?

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Autor: Stanczak Slawomir
Datum:  
To: exim-users
Betreff: [Exim] Exim - open relay ?
Hi !

I have a big problem with Exim-3.34-auth/tls. This serwer is first in my
domain (MX=10). Example:

name server - green.edu.pl
domain    - edu.pl


Every user has following alias example:

Jan.Kowalski:        janek


so messages for foollowing adress exim sends to janek@???:

janek@???        |
janek@???            |-> janek@???
Jan.Kowalski@???    |
Jan.Kowalski@???        |


This is works ok. But when I do telnet from other host;

$> telnet green.edu.pl 25
HELO green.edu.pl
MAIL FROM:janek@???
RCPT TO:janek@???
DATA
From: xx@???
To: xx@???
Subject: Test xyz
MIME-Version: 1.0
Content-Type: text/plain

Test xyz
.
QUIT

Exim sends this message. This is very good way for spam. What can I do
with it ?

My exim.conf:
[...]
primary_hostname = green.edu.pl
qualify_domain = green.edu.pl
local_domains = localhost:green.edu.pl:edu.pl
[...]

Thanks for your help.

Slawek