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Postfix sending mail to just other mail server

From: Alejandro Facultad (alejandro_facultadyahoo.com.ar)
Date: Fri Feb 22 2008 - 06:04:43 CST


Dear all, I have my Debian+Postfix mail server, and it has to be an
internal mail server. It shouldn't send mail to Internet, just to
another mail server from LAN.
This company has not a firewall, so I want to setup de Postfix
configuratioin files in order to say: "Postfix should send messages to
the mail server 10.0.0.21 and finally deny all".

How can I do that ???

Special thanks

Alejandro