qmail server communication

[gmo]

Hello,
i've 2 qmail-server, one intern (LAN) and one extern (DMZ), so how can i
configure, that the intern qmail server send email only to the extern
qmail server (DMZ)? The extern qmail server should only communicate with the
world. I use for each users unix accounts, intern and the extern.

Have you any idee? Thank for the help.

best regards

Gustav

qmail-intern<-->|Firewall|<--extern-qmail-->|Router|<-->Internet

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