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Subject: Re: Is this possible with postfix?
From: Lars Hecking (lheckingnmrc.ucc.ie)
Date: Fri Mar 03 2000 - 14:29:04 CST

Matthew Hagerty writes:
> 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?
 
 Yes, that's right. But, if I understand transport(5) correctly,
 it operates on the recipient domain (destination) only.

> Any suggestions on how I could do this would be greatly appreciated.

 I basically have the same setup here.

 On the internal smtp host, I set relayhost (in main.cf) to the name of
 the external host. relayhost is the default host when no entry in the
 transport table matches (and I'm not using a transport table on the
 internal).

relayhost = external.nmrc.ucc.ie

 On the external host, I'm using a transport map.

transport_maps = hash:/etc/postfix/transport (main.cf)

nmrc.ucc.ie :internal.nmrc.ucc.ie (/etc/postfix/transport)

 If you accept mail for more than one domain, you need more entries,
 of course.