My business email ISP provides a BoxTrapper.
Not to put too fine a point on it, but your ISP's BoxTrapper ain't worth a rat's patoot. You should give them what-for.
What browser are you using? In Mozilla's Thunderbird (8.0) it's pretty easy to block crap like this, and it's also got adaptive junk mail controls.
[I like Thunderbird because it complements my browser, Firefox (8.0.1).]
Another one of my email accounts has a spam blocker with a "blacklist" function which does such a fantastic job that even some legitimate e-messages with 'poorly phrased comment' get selected out of the stream so that I have to request their release from quarantine.
