email and dns issue regarding email delivery [solved/workaround]

[pstanbra]

Hi
I control a domains DNS on an external registrar name server.
I have a site hosted on my own server withi ISPCP

When I send an email to the domain, ISPCP seems to want to deliver the mail locally and the logs state that no email box exists which is correct.
My MX records are set up as needed on the registrar DNS but it seems when adding a new domain, ispcp assumes you are running DNS and have pointed to ispcp internal domain nameserver - I know this does not happen with commercial products as theres an option to turn off internal dns per domain.

Anyway - so the email bounces as theres no mailbox.
How do I tell ispCP to send email using the MX record and not locally.
Is this a postfix issue or a dns issue...