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What I am interested in is how to stop it? Is there any way to make these emails stop?
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Have to start this off by saying that you are not going to be happy with this answer but can only provide an answer based on what you asked
#1 - Can you <stop> it? Sadly the answer is: NO.
Somewhere, somehow, your email address has been harvested from somewhere. The <haveIbeenpwned> site is by no means intended to be 100% comprehensive
#2 - Re: "I am blocking every single one of them, and reporting as a spam but it's time consuming and frustrating"
a) Important to note that this does not result in anything immediate happening. This is accumulated and based on a number of factors such as how many other people report the same thing, the Outlook.com Junk filter gets updated
b) for information, if these messages are being delivered to your <Junk> folder, those are already considered <blocked> so there is no purpose as marking these as <Junk>. There is no option to prevent something from being <delivered> to your <mailbox>
c) if these junk messages are being delivered to your <Inbox> AND these messages have some common keywords, you can create an <Inbox> rule using the following settings
Condition: <Message header includes>
Value: ***whatever value you are looking for***
Action: <Delete>
Use inbox rules in Outlook.com
https://support.office.com/en-us/article/use-in...
This link will bring you to the <Inbox> rules
https://outlook.live.com/mail/0/options/mail/rules
(*** rules do not work for anything delivered to the <Junk> folder)
d) Creating a new account etc
There's no guarantee that you won't run into the same thing at some point. Also, just as a FYI, I have multiple Outlook.com accounts and not one of them receives any kind of <Junk> email *and I do mean "none". By the same token, I have a couple of other personal accounts (non-Microsoft) that get bombarded every day. I could cancel the accounts but the effort to do that is just not worth it (for me). Have opted to live with it.
Wish I could give you some kind of magic solution but the fact is that spam is the bane of everyone's existence these days