Now click Create Filter. Next time a message arrives from this mailing list it will go straight to its own mailbox and that mailbox will open up for you ready to read the contents. That is, of course, an excellent idea. If you do this though, don't filter those messages directly to the Trash. Instead filter them to a special Spam mailbox.
Filters are amazing and powerful, but can be a bit tricky.
Sequence is important, and even the best filters can misfile the occasional message. Filter to mailboxes and always glance at the message headers before trashing the messages themselves. Once you've set up a couple of filters you might be surprised by some unexpected results. Maybe a filter doesn't seem to work, or messages from your best friend go into the Spam mailbox. The cause is likely to be sequence.