I haven't had spam issues since using a catch-all and giving everyone a unique address, blocking ones that receive spam Won't work if you need a fixed address

I haven't had spam issues since using a catch-all and giving everyone a unique address, blocking ones that receive spam Won't work if you need a fixed address on a business card or something, but in case you don't... Waiting for the day they catch on. Then it's time for a challenge-response protocol I guess