I'm not sure how many list members there are but I think it's between 600
and 800.

If we all sent them one or two emails a day for a week saying "Thanks for
Spamming the Vanagon List" that would make 600 to 1600 emails a day.  I think
they would get the message and do a lot more to deter spamming that a simple
complaint to them and their provider.  Unit and fight spamming.