spamming a lot of messages on the server

hi
I have been facing a big problems for three days, the exim_mainlog shows a lot of messages being sent to random names at mydomain
mydomain is called cairoserver.com

2005-02-21 17:21:47 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1D3FNW-0001NO-6Z
2005-02-21 17:21:47 1D3FNW-0001NO-6Z => :blackhole: <AGKSTN@cairoserver.com> R=virtual_aliases
2005-02-21 17:21:47 1D3FNW-0001NO-6Z Completed

how could that be disabled

 

 

 

 

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