Unsubscribe from daily emails

How does one unsubscribe to daily emails? I found that I prefer to go the DPW site directly rather than getting a bunch of emails. I just sent off my third request to the email address (subscribe-daily-paintworks+unsubscribe@googlegroups.com) and I have very little faith that it will occur.

I really enjoy DPW, but have to confess that I am getting annoyed by this.