Hi guys,
Thank you for your help, I attempted to do a purge as you suggested, however:
dpkg: error processing postfix (--purge):
subprocess installed pre-removal script returned error exit status 100
Then i tried: sudo dpkg --force-all --purge postfix
and got the same problem...
I remember trying to install postfix a while ago and might have made a mess of it, I believe it was one of the times apache2 went out of control because of WP and crashed the server so it never completed the installation.
Daniel