Thanks for the excellent tips for moving ISPConfig between servers. However, with regards to the following step:
Originally Posted by falko
echo "* smtp:[<IP address of new server>]" >> /etc/postfix/transport
This won't work until you add the following line to /etc/postfix/main.cf :
transport_maps = hash:/etc/postfix/transport
and restart Postfix.
Mails on my old server weren't being relayed to the new server until I inserted this line!