Email Routing - Domain Proxy

the main reason for use Cloudflare is be anonymous.
i create my server with my public ip but i don’t want to share that with the world, i use Cloudflare that use them ip and protect me.
with this idea in mind, i start to think that the only thing that Cloudflare didn’t protect is mx record which someone could use to find my real public subnet; so why isn’t possible to use email routing as this, in other words, i set Cloudflare “mxrecord”, and each mail is routed to my real mx server as a proxy. both have the same domain name like
[email protected][email protected]
this could be very great to protect my domains.