The imagerocket.com domain is listed in WS and appears in a message received today from bizrate.com. I use bizrate myself (though this message wasn't to me), so I know they aren't hard-core spammers. The message source is attached.
I'm not familiar with imagerocket.com, so can't say whether they'd be a good spam indicator if the message wasn't from bizrate.com.
Bret
----------
Send your spam to: bretmiller@wcg.org Thanks for keeping the internet spam-free!