postfix: deliver mail to specific emai addresses locally and send the rest to relayhost

I finally figured out the correct syntax in the transport configuration file:

Add the following to /etc/posfix/transport:

[email protected] :
*    relay:[my.mailserver]

and run

postmap transport
postfix reload

The correct way to do this is add the following to /etc/posfix/transport

[email protected] local:
*     relay:[my.mailserver]

Then add the following to /etc/postfix/main.cf:

transport_maps = hash:/etc/postfix/transport

Then run:

sudo postmap hash:/etc/postfix/transport
sudo /etc/init.d/postfix restart