Date: Wed, 20 Dec 2006 11:46:30 +0300 From: "Andrew Pantyukhin" <infofarmer@FreeBSD.org> To: Alexei <root@sovetnik.org> Cc: freebsd-net@freebsd.org Subject: Re: border mx Message-ID: <cb5206420612200046y7cf0e947g3856fcb84de2665d@mail.gmail.com> In-Reply-To: <884597862.20061220101424@sovetnik.org> References: <884597862.20061220101424@sovetnik.org>
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On 12/20/06, Alexei <root@sovetnik.org> wrote: > Hello, freebsd-net. > > I'm going to build some mail system, so I need some advice. > There is a network with a 'MS Exchange' as a mail server and > 'someintdomain' as an internal mail domain. I also have an internet > domain, for example 'mydomain.com'. There is a freebsd box as a > gateway for my network, and 'MX' record of 'mydomain.com' will point > on it's address. > What I need: > > - when someone sends mail from internet to 'vasya@mydomain.com', my gw > replaces vasya@mydomain.com with 'vasya@someintdomain' and sends it to > Exchange server > - when someone from my internal network (vasya@myintdomain) sends mail > to some internet mail address (ie sends it to ms exchange server and > exchange sends it to gw), my gw replaces 'From:' and 'Reply-to:' > fields vasya@someintdomain -> vasya@mydomain.com > > Is that real? How can I realise this system? Or, maybe, there is some > other way to get the result I need? > > PS: 'Exchange' server has 'grey' address (192.168.0.0/16) and I don't > want allow him connect to the internet directly. > PPS: Sorry, if this question is not suitable for this maillist, so > advise me please where to ask. I would redirect you to another place but most of what you want is discussed in almost any mailserver's manual, even that of Exchange, I'm sure. A couple of pointers: 1) You are right in not wanting to directly connect a 192.168.x.x address to the internet, your ISP wouldn't appreciate that ;) 2) Spamwise, the gw mx should be able to tell a valid (internal) address from an invalid one. There are different approaches, from importing aliases db from Exchange at regular intervals to verifying addresses over SMTP and what not. Good luck!
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