find out which website is used for sending email?

[Peter Peltonen <peter.peltonen@xxxxxxxxx>]

I got a report that my CentOS 5.4 is used for sending spam.

>From sendmail maillog I can see that apache has been sending a lot of
email to suspicious addresses.

Probably one of the many Apache virtual hosts I have is used for
sending spam. But how to find out which one?

Regards,
Peter
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