As the suspension indicates, the problem is it is capable of forging headers. This is the type of thing that got us blocked pretty much permanently at hotmail and a few other email hosts.
We suspend -before- it can become a problem because we cannot allow 1 account to put all the others at risk, which is exactly what the abusable header-forging email prank scripts do. We cannot remove this suspension.
Edit: Oh I forgot to mention - the scanner that caught you only catches a file when it's ran, so even if you didn't get a chance to use it for a prank email, it -was- ran which shows intent to use.