I use Kerio for email service and have setup Postfix to handle outgoing email on the same hardware. I'm using Postfix for outbound email since it can be bound to a particular IP address and Kerio cannot. Setup looks like this:
Kerio SMTP ---> (127.0.0.1) Postfix ----> (public IP) Internet My problem occurs when Postfix can't deliver an email, might be a non-existent email address for example. Postfix generates a bounce message for the sender but won't deliver it and complains that it "loops back on myself". I've tried using a separate IP for each STMP server and explicitly binding SMTP to separate addresses in master.cf but I still get the same error. I've also tried setting up a transport map like this: smtp:[192.168.1.2] without success. I'm relatively new to Postfix, so I've read both the docs and Rolfe Hildebrandt's excellent book but I'm still at a loss. Any suggestions or advice would be appreciated. Rick Hazey
