A month or so ago I emailed "postmaster", "webmaster" etc at all the domains that I got emails from. Some did not even have a postmaster account, some said the mailbox was full. Given that we still get these I don't think I was very successful, I hope you have more success.I really hate that I have to reply to people directly, due to the crapload of autoresponders, so I've taken to harassing the owners of them on their own websites.
Now, if everybody else here were to pick just one of those goddamn auto-responders and put in a little effort towards coercing them to unsubscribe, we might get somewhere.
Regards
Chris