Are you basing the 50% based on what is after the "@", i.e. gmail.com and yahoo.com? Or are you looking at what server the MX points at. It's very easy to hav

Are you basing the 50% based on what is after the "@", i.e. gmail.com and yahoo.com? Or are you looking at what server the MX points at. It's very easy to have your own MX for your domain point to a google mail server.