Seems like webmaster at domain is often a black hole anyway. Anyone who still has 
an unpatched IIS is unlikely to have set up a proper webmaster mail account.

Quoting Yaron <jethro at freakzilla.com>:

>   Hi,
> 
> On Tue, 7 Aug 2001, Spencer J Sinn wrote:
> 
> > Making changes or modifications to anyones machine without their
> express
> > consent is illegal. Setting up an auto-mailer to contact the webmaster
> > is not a bad idea.
> 
> Except a lot of these are dorky kids running NT with no mail support.
> 
> 
> -Yaron
>