Hello ! I'm Nelson and I would be glad to assist you today, I'm sorry that you are experiencing this issue.
To block someone in Outlook.com, select the messages or senders you want to block.
From the top toolbar, select Junk > Block (or Spam > Block).
Select OK. The messages you select will be deleted and all future messages will be blocked from your mailbox. Hope this helps
Nelson
I get 50 to 75 junk emails a day, yes every day. For months now this has been going on.
What you suggested above "to select the messages or senders you want to block.
From the top toolbar, select Junk > Block (or Spam > Block).
Select OK. The messages you select will be deleted and all future messages will be blocked from your mailbox".
I have been doing that for months now on every junk email and they keep coming back, the same emails I just clicked on block.
My block emails menu does not work at all. I also tried "Report phishing" and it does not work.
This should be sent to Microsoft Office 365 to let them know that my Outlook email app is defective.