Identifying Domain Generating SPAM Mails

[shajay]

Hi,

I am having near about 140 Domains on my Linux Plesk 7.5.4 Server. I feel some domains are spreading SPAM mails using scripts, So I want to keep track of all (SPAM) mailing sent by the Domains on my Plesk Server, Please guide me how can I do so?

Thanks,
SHASHA