Proxy caching - could make this a rather futile excercise, plus the **** it hits don't include my usual ones - like the greencard spam.
A better tool is the "Unsolicited commando" - which fills the site forms with believable junk.
http://www.astro*******s.net/uc/index.jsp
Of course, you may have a problem with the fact that the "attack orders" are not under your control.
PS. If you ever find a genuine email address for a spam site (view source on their contact / order form page), enter it mercilessly in any other site that you believe will spam the address, like the always fake "remove me".