Hello... after reading the post from Falko as well I've changed the server name.
In ISPConfig have changed the name of the server to server1.urbancampsite.com
In /etc/postfix/main.cf have changed myhostname to server1.urbancampsite.com
service postfix restart
Still no success sending from firstname.lastname@example.org
The was no spacial reason to have my own name servers, I just figured while I was going to have a crack at this I'd get my own nameservers and learn a bit about that as well... I figured that it would better for clients to have ns1.urbancampsite.com rather than ns1.somebodyelse.com that's all...
Webmin is now installed Falko so if you've got further thoughts...