Email A bit lost but near to the end of the tunnel!

I'd appreciate some clarification:
The hostname I set in centminmod was hostname.blognetwork.com
Then I created a vhost for blog.com

Blog.com was pointed to DNSMadeEasy. There are two A records for blog.com pointing to the server IP (A IPv4 and AAA IPv6).

Then hostname.blognetwork.com is a A record pointing to the server IP.

Am I missing something? Is it OK what I've done?