Are you using DSO on the machine for the PHP handler? If so, I would suggest switching to suPHP and then changing this to "On" in WHM > Tweak Settings:
Prevent “nobody” from sending mail
The email you've provided was sent by the user nobody, so it isn't even possible to track down any other details without a lot of effort:
1QU3hD-0004bX-KY-H
nobody 99 99
<
[email protected]>
1307481619 0
-ident nobody
-received_protocol local
By preventing nobody from sending emails, you'll stop these emails. Unfortunately, if you are using DSO for the PHP handler (WHM > Apache Configuration > PHP and SuExec Configuration area shows your current PHP handler), then you cannot stop the user nobody from sending emails as PHP scripts run as nobody and any mail script will run as that nobody user.
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