I agree that I'm probably not worth the effort, but if this kind of domain wildcard strategy were to become more popular it is entirely feasible for a rudimentary machine learning algorithm to detect its use.

> unless you're keeping a lookup table you're losing a great benefit of the wildcard

That's true, I don't keep a lookup table per se, though I do have a deleted items folder that I could look back in. I'm not sure what I would do, though, if I knew what particular company sold my email address? Send them a nastygram they will just ignore? I just block the address and move on.