OH MY GOD!
Don't take this the wrong way but..
I love you to the very extents of which a man should ever love another man!
I've been awake for 48hours trying to figure out what wrong going over dns settings, my wan devices, iptables, wiki's, bind manual the lot and i completely over looked the zimbraMtaMyNetworks thing staring me in the face.....
I had my old ip in the center.... all i needed to do was
zmprov modifyServer mailserver.myservername.com zimbraMtaMyNetworks '127.0.0.0/8 192.168.80.0/24 [public ip here]/32'