My Outlook inbox is suddenly getting a ton of spam and I don't know how to stop it

What you're asking cannot be done here. They have automated spam filters and if they fail, you're getting a lot of SPAM in your inbox.

With rules, you're at least doing a setup that blocks most of them. Not a solution but better than manually deleting tons of spam.

I'm not happy with this either.

You can try making some rules. The SPAM i received had more or less the same keywords, so i made a rule (settings-> mail -> rule) that checks for subject includes and message body includes the spam words and in action select to move them on junk folder and make them read (or delete them). I prefer to have them on junk folder so i can check for false positives.

Hope this helps a bit.

Best thing would be if they fix their SPAM filters.. last couple of days i getting really obvious spam on my inbox!

No, your answer didn't help at all.

The point is to block completely those spams, to receive the sender a message from his/her mail host as undelivered. To not even come to my email. Not to go even to spam or deleted folder.

You can try making some rules. The SPAM i received had more or less the same keywords, so i made a rule (settings-> mail -> rule) that checks for subject includes and message body includes the spam words and in action select to move them on junk folder and make them read (or delete them). I prefer to have them on junk folder so i can check for false positives.

Hope this helps a bit.

Best thing would be if they fix their SPAM filters.. last couple of days i getting really obvious spam on my inbox!

That may be true, except i have never used Shopify.

side note: the onslaught of spam emails has suddenly stopped nearly 100%! i suspect there was some defect in Microsoft's spam filter and it has now been fixed. YAY

The emails all have a common unsubscribe url k-lists it’s called if I remember rightly done some digging and k-lists is part of the klaviyo domain done some further digging and klaviyo are partnered with Shopify. Hence this all started after signing up to Shopify payment plan!

I do this every day, does not make any difference, so i let it accumulate and i got 172 in six days, totally fed up with microsoft. Ron..

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