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Subject: Re: Is this possible with postfix?
From: Wietse Venema (wietseporcupine.org)
Date: Fri Mar 03 2000 - 15:05:46 CST

Have the MX record point to the external host.

    my.domain IN MX 10 external.my.domain

On the external host, use a transport map

    /etc/postfix/transport:
        my.domain internal.my.domain

    /etc/postfix/main.cf:
        relay_domains = my.domain

On the internal host,

    /etc/postfix/main.cf:
        relayhost = external.my.domain
        mydestination = my.domain, internal.my.domain localhost.my.domain ....

People with firewalls do this all the time.

        Wietse

Matthew Hagerty:
> Greetings,
>
> Is it possible to accomplish a configuration like this with postfix:
>
> +--------+ +----------+ +----------+
> Internet ---->| Public |---->| Internal |---->| Internal |
> <----| SMTP |<----| SMTP |<----| Client |
> +--------+ +----------+ +----------+
>
> The Public SMTP server is MXed as the email host for my.domain. All email
> from the Internet comes in through this host and is forwarded to the
> internal SMTP host for delivery. All internal clients use the internal
> SMTP server for incoming and outgoing email. The internal SMTP server
> should forward all outgoing email to the Public SMTP server for delivery.
>
> I thought I could do this with a transport map on the Public server
> pointing to the internal SMTP server and vice versa, a transport map on the
> internal SMTP server pointing to the Public SMTP server. But what I really
> got was a big mail loop. I seems the transport map looks at both incoming
> and outgoing email?
>
> Any suggestions on how I could do this would be greatly appreciated.
>
> Thank you,
> Matthew Hagerty
> matthewvenux.net
>
>
>
>
>