Part of my comment on GMail was an implicit jab at the monoculture it engenders. It was crystal clear to me that this attack isn't limited to GMail. I would lik

Part of my comment on GMail was an implicit jab at the monoculture it engenders. It was crystal clear to me that this attack isn't limited to GMail. I would like others to consider what other service could be spoofed like this with anywhere near as good return on investment, precisely because other services aren't as widely used.