It would be great to see a full step-by-step tutorial on how to get a free SSL from CloudFlare for a custom domain working on Infinity Free. I don’t know if there is one (haven’t found one yet).
Any chance of seeing this in the knowlege base soon?
Side note: this is not true. MX records only stop working if you use our Cloudflare integration, not if you sign up with Cloudflare directly. When switching your nameservers to Cloudflare, the MX record configuration is all up to you.