From owner-freebsd-security Thu Oct 22 13:07:15 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id NAA21665 for freebsd-security-outgoing; Thu, 22 Oct 1998 13:07:15 -0700 (PDT) (envelope-from owner-freebsd-security@FreeBSD.ORG) Received: from lily.ezo.net (lily.ezo.net [206.102.130.13]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id NAA21643; Thu, 22 Oct 1998 13:07:12 -0700 (PDT) (envelope-from jflowers@ezo.net) Received: from lily.ezo.net (jflowers@localhost.ezo.net [127.0.0.1]) by lily.ezo.net (8.8.7/8.8.7) with SMTP id QAA08153; Thu, 22 Oct 1998 16:05:46 -0400 (EDT) Date: Thu, 22 Oct 1998 16:05:45 -0400 (EDT) From: Jim Flowers To: Juergen Nickelsen cc: Chad Thunberg , freebsd-security@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: firewall + internal mail server In-Reply-To: <362F773A.AB9F196B@tellique.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org A fairly simple way would be to use a hidden dns. Run sendmail normally on your fbsd machine with resolv.conf entry pointed to internal (hidden) dns server hosting MX resource record pointing to internal mail-hub host running smtp. MX records on external server (at ISP for example) point to your fbsd machine. That way the only external dns record necessary is your mail-relay so all the good stuff is hidden from the rest of the world. Mail is sent to your mail-relay and then relayed on to your internal mail-hub and you don't have to modify your sendmail setup at all. Even better if you use a wrapper like smap. Jim Flowers #4 ISP on C|NET, #1 in Ohio Juergen wrote:------------------ > > As we are just a few people here yet, this is bearable, but for a > long-term solution I'll have to work out a sendmail configuration > where the mail exchanger for the domain delivers the mail to a > non-MX. I am sure there is a simple way, but I don't know it yet. > > Greetings, Juergen. > > -- > Juergen Nickelsen To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message