I get a ton of junk mail. Usually, Mail does a good job of flagging them and they usually show up orange but I still get alerted when I get new junk mail. It's very annoying because in a few hours, I usually get like 10-20 new mails only to find out that they're all junk. How can I setup a junk mail bin so that I won't get alerted anymore when new junk mail arrives?