Block a domain

I am receiving multiple spam emails each day from a “consumerbest.net”. Is there any way to block messages from that domain? Each spam begins with a different name, but each is from the same domain. I have been blacklisting these individually and marking them as spam, with multiple spam emails daily this is getting old. It would be much better if I could blacklist the entire domain, but I can’t find a way to do this with the current on-line interface.