I found a greasemonkey script that can spam the spammers back.
https://userscripts.org/scripts/show/171505
I just sent them about 10,000 spams.

ttguy, better don't spam them, it probably does not have any effect, and you yourself could maybe get in trouble for spamming?

"you yourself could maybe get in trouble for spamming?"
I would love it if my spamming had enough of an effect that made them try and take action against me. That would be the ideal outcome actually.

You should also note that greasemonkey can be installed in the Tor browser. So you can spam them anonymously.
Of course I am not being to anonymous right now. But you can do it.

They can always see your IP in the email header, so it is actually impossible to send an email anonymously, even if you send your email using telnet.
Anyway, what I was thinking of is that maybe your ISP thinks you are a spammer and cuts your connection or so, that would be a shame.

I am fairly sure that by using tor browser and the tor network you can be anonymous. See https://www.torproject.org Yes I have an IP address when I use Tor but it is not the IP address of my ISP. It is the IP address of the tor exit node. And it is my tor browser that is sending stuff to the kitchen spammers not my email client.
On the other hand I am a newbie at this so I could be wrong. Dode - do know much about tor?

First of all, I want to make sure that you know that of course, like I'm sure everyone else here, I appreciate your effort against spam in this forum. And I don't want you to get into trouble :-)

I don't know Tor at all, but if I understand it correctly, it is some distributed service consisting of volunteers who basically anonymize the requests made by users of this system. So for me this means that if you use Tor to send spam, you abuse the service to do something bad.

And anyway, it does not even seem to be possible to do that if you read their Abuse FAQ: https://www.torproject.org/docs/faq-abuse.html.en#WhatAboutSpammers