Assist with Email Server config

I am currently setting up 2 VPS servers, 1 will host many different websites/domains the other will host the email for these different sites, i will be using Cloudflare for the DNS, the VPS servers use Cyberpanel on Ubuntu 20.04. I need the email server and cloudflare dns to be setup in such a way that i can score perfect 10 in email send ability.

Looking for someone who can do a screen share and talk me through the correct setup