1. You must have DNS services somewhere. I am similarly setup abd I use
www.zoneedit.com.  Free and competent.  

2. Most cable-based broadbands and DSL do have a fixed dns string.  Mine
is in the form of <cable-modem-mac>-<cpe-mac>.<a>.<b>.<ips>.com.
Reverse look-up your own dynamic ip and see what it resolves to.  Use
this as input to your dns entries (zoneedit.com).

3. Strongly recommend also configuring spf and domain-key signing via
your dns entries.  This helps "sane" sites to not flag you as a spammer.


-----Original Message-----
From: L. V. Lammert <[EMAIL PROTECTED]>
To: Douglas A. Tutty <[EMAIL PROTECTED]>
Cc: OpenBSD Misc <misc@openbsd.org>
Subject: Re: running mail server at home
Date: Thu, 7 Feb 2008 09:38:30 -0600 (CST)
Delivered-To: [EMAIL PROTECTED]

On Thu, 7 Feb 2008, Douglas A. Tutty wrote:

> On Thu, Feb 07, 2008 at 02:51:31AM -0800, Chris wrote:
> > I have a P3 box with 120GB HDD that's doing web, ssh and samba at the 
> > moment. I
> > am planning setup sendmail, spamd, mimedefang, clamd and spam-assassin
> > on this box along with web, ssh and samba.
> >
> > I was wondering if anyone has any experience with running a mail
> > server at home.
> >
In reality, you cannot run your own mail server at home. This would
require:

1) DNS resolution for your domain name
2) Appropriate MX records
3) Valid REVERSE DNS for your IP

#3 is usually the big factor for most ISPS, without it, you will not be
able to send email to any 'sane' mail server.

        Lee

================================================
  Leland V. Lammert            [EMAIL PROTECTED]
    Chief Scientist     Omnitec Corporation
 Network/Internet Consultants   www.omnitec.net
================================================

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