A couple of companies regularly sent me spam disguised as a newsletter. I'm completely sure I didn't subscribe to anything from them. Their unsubscribe systems

A couple of companies regularly sent me spam disguised as a newsletter. I'm completely sure I didn't subscribe to anything from them. Their unsubscribe systems and polite requests didn't work. The worst was that GMail didn't learn to mark them as spam. I found a nice GMail feature: I could create a filter that killed their spam from my inbox and then sent a copy of the message to the addresses that I chose, that were the abuse, postmaster, etc. that previously had ignored me. I also added addresses from DNS database and the staff of the spammers. Unfortunately this feature seems to be disabled for some time now. The filters I created are still there, but I can't create more of their kind.