[exim] What to set as last router

Hi all,
what to set as last router that the rest of addresses is bounced as
'unknown user'?
in the moment my last router processes the mailing lists. Here I have
included a errors_to statement to send me specific messages if there are
problems with the lists and not the sender.
But now, because this is the last router, all unknown user emails are
delivered to me too

Regards
Rainer Sigl

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Rainer Sigl,                      | email: sigl@???
MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3557
Postfach 1312,                    | fax:   +49 (89) 30000-3569
D-85741 Garching, Germany         | web:   http://www.mpe.mpg.de/~sigl/