Report them to mailchimp here: http://mailchimp.com/contact/abuse/ http://mailchimp.com/contact/abuse/ I can't speak for them, but I've reported spam senders u

Report them to mailchimp here: http://mailchimp.com/contact/abuse/ http://mailchimp.com/contact/abuse/ I can't speak for them, but I've reported spam senders using other commercial senders and generally get an acknowledgement that it's looked into and they don't tolerate abuse.