Configuring preferences and options in Outlook.com
Hello Fuzzbox000
Hi, I'm Karl and will be happy to help you today.
Messages delivered to the Junk folder are already considered blocked by the Outlook.com Junk filter. There is nothing more you can do about those messages. There is no option to completely prevent something from being delivered to the "mailbox". You cannot create a rule since rules only apply to items delivered to the Inbox and the Outlook.com Junk filter runs ahead of any rules. Also for information, any messages sent by senders on the Blocked Senders list get elivered to the Junk folder.
I have an article on the Junk folder and filter that you may find of interest
Basics: About Outlook.com Junk filter and folder https://answers.microsoft.com/en-us/outlook_com/forum/outlk_com-outtop_account/basics-about-outlookcom-junk-filter-and-folder/0d539809-c0fb-44fb-bd1b-d172c0dcae47
If you have any questions, don't hesitate to ask, we're here to help you further if needed.