[Exim] how to block big@boss.com

Hello list,




I got lots of emails which were sorted out containing a virus


sent by big@???.




I have a director for users which are not located at me.




failed_user:


driver = smartuser


new_address = "${lookup{$local_part} \


lsearch{/etc/exim/maps/fail_user}{:fail:\"unknown recipient\"}{$local_part}}"




how can I block unknown senders, too ?




Thanks for any help appreciated.




tom






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Thomas Baumann // Postfach 110115 // D-64216 Darmstadt // <tom@???>