[Exim] how to trace user mailsending mails as "nobody"

HI,

1.On my shared hosting (cpanel) , One user sending mails(spam)
as 'nobody'. Is there any way to trace that username , so i can delete
him/her.

example log:
2004-06-27 13:18:07 1Beg6H-0003ay-Gp <= contact@???
U=nobody P=local S=4763

he is using fake from address. please help


2.Is there any way to stop scripts like perl to send mails using by
connecting
directly port number 25 (ignoring mail server) ?


- thanks for your time.





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