I'm right now trying to get rid of the direct-connect subdomain which gets added automatically and is not visible in the CloudFlare DNS panel. I've read about it here; https://support.cloudflare.com/entries/22031661-why-do-i-have-a-direct-connect-subdomain and there is a very important thing which is bothering me. "If you're not receiving mail on the domain, simply delete the MX record;" Does that mean that if I only send mail from the domain but not receive them that I can delete the MX record?
I couldn't care less about receiving mail, but sending is essential for my website.
For your info; I'm talking about the direct-connect subdomain, not to be confused with the direct subdomain CloudFlare optionally adds. (I have disabled that already)