I'm running an experimental server at home.
Now I can access it at www.myservername.com from outside my home network without issues by using the Custom DNS Record and setting the Type to CNAME, then pointing that ty my dyndns.org name.
I can access wild card domains also I.E. *.myservername.com so stuff like mail.myservername.com ftp.myservername.com, ect all work.
But if I try just myservername.com It will not resolve to my home testing server.
And if I try to add the name (Blank) myservername.com under add a custom DNS Record for myservername.com I get
CNAME Records may only be used on sub-domains so How do I configure the root name ?