This isn’t really a new problem. Back in 1995, I was the Sr. Internet Mail Administrator at AOL. We were doing everything we could to fight the spammers.

We found that we would work on a new technique over a period of weeks or months, and then they would find a way to work around our technique in a single weekend.

Rinse and repeat.

The only thing that has changed is that the market for scammers has moved, and they’ve gotten a lot better and faster at adapting to your protection techniques.