Create A Blacklist In Gmail Using Filters

Yahoo mail has a blacklist, but Gmail doesn't. What the blacklist does is a step above sending messages to spam - it deletes the message, giving you no indication the message has been received. Which doesn't stop the person sending the message, but if you can't see it, it doesn't matter, I guess.

You can do the same thing in Gmail with a filter:

So create a new filter, and put the senders or domains (is it @domain.com or just domain.com?) you don't want in the from field, separating them with OR (| pipe symbol also seems to work). I suggest applying skip inbox, delete it, never mark it as important. I also applied a label so I can quickly check my bin if this is working.