We do not support domain mapping by A record or CNAME, just name servers.
Your site does not have a static IP address or specific server. Instead, requests to load your site are shifted between several IP addresses and servers in order to balance the demand on servers. This means that specifying an IP address or server won't work.
I took a look at what you had entered for your email, and you appeared to have been missing a few crucial records, so you might want to double-check what you had with your email provider.