It can be worse than that. Sometimes 'unsubscribe' is a phishing/hacking thing. It's better to never click on links unless it's from someone you actually know.
Sometimes Yahoo recognizes an unfamiliar message as being spam, but in reality it could be from someone that you only recently got involved with.
I've had that problem with ALL of my email accounts, in some cases even when senders are in my 'address books.' So I developed the habit of looking at my spam folders daily to make sure nothing important was put there.
Yahoo puts bulk-recipient stuff in there that I want to read, even though I have the sender set up as a Contact. So I go through that folder every few days. I bet I get more "junk" in my Inbox than I get true "Spam" in the Spam folder.
Heck. My comment was not an admonishment, I was saying "Right on, Sister!" Not all of this stuff works as advertised. I want my money back
Since I started using the current CAPTCHA registration system, where you have to answer a question, and I personally approve or disapprove accounts, we haven't had very many spammers here, and most of those who we have had were ones who I kind of suspected were going to spam us. When we get a new registration from Russia or one of the Middle Eastern countries, I have a pretty good idea that it's going to be a spammer but I don't want to simply ban everyone from these parts of the world because it would be interesting if we did get English-speaking members from these regions, so, unless they show up on the spam watch list that I subscribe to, I approve them, then wait to see what they do. They usually turn out to be spammers, although some will wait for months after getting an approved membership before making their first spam post.
Interesting. I have the habit of pulling up the New Members and scrolling through their initial posts. There was a period where we had a spate of idiots, but it's gone into remission. Now I understand why.