Exim and Server Load

hi all,

it's serveral days now that i have really high server load caused by exim. (sometimes it goes over 15.00)
Going to ckeck the exim stats i can see the following stats (this stats are for a few hours only)
===================================
205MB local
149MB mailnull
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Top 50 host destinations by message count
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21024 415MB local
-----------------------------------------
Top 50 host destinations by volume
----------------------------------
21024 415MB local
----------
7172 27MB :blackhole:
====================================

but there is nothing i can see the sender. About the "local" "mailnull" with user send this messages out? is there any way to trace the user? or are this messages sent by a cgi script? Is there a way to dosable the SMTP server (temporarly) without shutting dow exim. I just like to block the SMTP for a while so that users cannot send e-mails trhought there mai.domain.com but not the pop3.


BTW: where are going e-mails listed as :blackhole: Will they be stored somwhere on the server or will they be deleted?



Thanks a lot

 

 

 

 

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