Sending, receiving, and organizing email in Outlook.com
Hi, I'm Brian and I'll try to help.
If messages are arriving on your Junk Email folder, they are already considered "blocked" and adding the From address of those messages to the Blocked Sender list won't help in any regard. Messages delivered to the Junk Email folder will automatically delete after 10 to 30 days, so why worry about them? You can, every few days to a week, review whaat's in that folder by looking only at the From address and subject. You won't see anything very offensive that way and you can mark any falsely misfiles messages as not junk so you'll receive them in the future. Everything else, ignore and it will go away on its own.