Spam should be a recipient problem

Today (though not for the first time) I had the following episode: the mail.ru mail server decided that my provider’s SMTP server was an open mail relay, and banned it.

Actually, I decided to comment on this.

The very essence of e-mail comes down to the fact that if a person sent a letter to the correct address, he does not wait (and cannot wait) that his letter will not be accepted. Of course, I'm not talking about cases of exceeding the quota for sending files, this is a separate question.
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I would like to remind many who use any automated spam killing system that fighting spam on the recipient’s side is a good thing, and not trying to pass it on to the sender’s head.

I understand that spam has got it, and that the Spam-center “Stream” is worthy of a local nuclear strike, but never a hundred remote (or undelivered) letters from the spammer was not worth one, but important letter.
Especially when you wait for him.