You don't need to copy the your exchange users to your postfix server to allow relaying. Just configure postfix to allow connections from the exchange server (default if the servers are on the same subnet), and configure exchange to use the postfix server as the relay. For incoming mail, configure the transport maps of postfix.

transport_maps = hash:/etc/postfix/transport

and in /etc/postfix/transport

localhost local:
localhost.your_localdomain local:
your_hostname.your_localdomain local:
yourdomain smtp:ip.address.of.exchangeserver(or hostname of exchange server)


you need to run 'postmap /etc/postfix/transport' and make your postfix server the primary mx.

Ruel Masil wrote:
Sirs,

I have to 2 mail servers(Sendmail and Exchange). The Exchange is on the LAN
side of the firewall and the Sendmail is on the DMZ side of the firewall.
I'm planning to make a Postfix mail relayer which will relay/scan all my
mails first then forward the mail on the right server. I have read some
documents about this but it suggested that I should copy all users both
servers. I also read some documents about running sendmail as mail relay and
it does not recommend anything about copying users.

Do you have any notes regarding this configuration or any web links were i
can read. Thanks uli.

Bulatitoy :)
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