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Help with open relay needed

Hi everybody,

we thought for a long time that our system (uni-paderborn.de) is fixed
against third party relay, e.g. see the test at
http://maps.vix.com/tsi/ar-test.html   .
Now we got surprised that we can not pass the test that ORBS.org 
is doing and that we are now to be found on some blacklist :-(

The test does the following:
29716r  HELO relaytest.orbs.org
29716   -- policy result=0, msg: <NONE!>
29716w  250 uni-paderborn.de expected "HELO wwwhost.manawatu.net.nz"
29716r  MAIL FROM: <>
29716   -- policy result=0, msg: <NONE!>
29716w  250 2.1.0 Sender syntax Ok
29716r  RCPT TO: <orbs-relaytest@manawatu.co.nz>
29716   -- policy result=0, msg: <NONE!>
29716w  250 2.1.5 Recipient address syntax Ok
29716r  DATA
29716w  354 Start mail input; end with <CRLF>.<CRLF>

and I dont know by now why we would block the mail if the mail from: was
something like<abc@def.com> and why we don't block it if it comes from: <> 

Maybe somebody has an idea when he/she has a look at our config and is
faster than us rereading the manual.

smtpserver.conf includes the following lines:
localhost           99  ve
*.uni-paderborn.de  99  ve
\[131.234.*.*\]     99  ve
\[*\]               99  veR
*                   999 veR

db/smtp-policy.src includes these lines:
.                       relaycustomer - senderokwithdns + message "We do
not relay for you!" acceptifmx - test-dns-rbl +

[]/0             relaycustomer - senderokwithdns + acceptifmx -
test-dns-rbl +

_our_network            = _full_rights
_full_rights    rejectnet - relaycustnet + relaycustomer + relaytarget +
_localnames     rejectnet - relaycustnet - localdomain + relaytarget +
.uni-paderborn.de       = _our_network
[]/16        = _our_network

We are still running zmailer-2.99.49p9, but I hope that we can enable the
required blocking mechanism quickly without preparing an update.

Thank you very much for helping us getting away from the blacklist.

Kind Regards,

 Dipl.-Ing. Juergen Maniera

 Universitaet-GH Paderborn          Tel.: (+49) (0)5251 60-3326 
 FB 17, AG Softwaretechnik / IRB    Fax:  (+49) (0)5251 60-3714    
 D-33095 Paderborn                  email: sammy@uni-paderborn.de 
 Raum: E3.125                       http://www.uni-paderborn.de/cs/sammy.html