From owner-freebsd-questions  Sat Sep 27 15:58:03 1997
Return-Path: <owner-freebsd-questions>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id PAA18405
          for questions-outgoing; Sat, 27 Sep 1997 15:58:03 -0700 (PDT)
Received: from awfulhak.demon.co.uk (awfulhak.demon.co.uk [158.152.17.1])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id PAA18396
          for <freebsd-questions@FreeBSD.ORG>; Sat, 27 Sep 1997 15:57:49 -0700 (PDT)
Received: from gate.lan.awfulhak.org (localhost [127.0.0.1])
	by awfulhak.demon.co.uk (8.8.5/8.8.5) with ESMTP id XAA06540;
	Sat, 27 Sep 1997 23:57:26 +0100 (BST)
Message-Id: <199709272257.XAA06540@awfulhak.demon.co.uk>
X-Mailer: exmh version 2.0zeta 7/24/97
To: Eivind Eklund <perhaps@yes.no>
cc: Bruce Albrecht <bruce@zuhause.mn.org>, freebsd-questions@FreeBSD.ORG
Subject: Re: sendmail and ppp -auto 
In-reply-to: Your message of "Sun, 28 Sep 1997 00:10:55 +0200."
             <199709272210.AAA13087@bitbox.follo.net> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Sat, 27 Sep 1997 23:57:26 +0100
From: Brian Somers <brian@awfulhak.org>
Sender: owner-freebsd-questions@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> > 
> > I just started using ppp -auto, and whenever sendmail starts up or I
> > get any new mail, ppp connects to my ISP.  How do I trace this?  I
> > don't know how.  Is there something I should add to my sendmail
> > configuration?
> 
> You need to add -DNAMED_BIND=0 to your sendmail compilation.  (Yeah,
> this mean you have to recompile sendmail.  Doing that together with
> having a FEATURE(nodns)dnl in the sendmail.mc file is the only way
> I've found to stop this).
> 
> Eivind.

Or you could just set some dfilters for port 25 & 53 in ppp.conf.  
Check out the FAQ section 10 for details (and a DNS example).
-- 
Brian <brian@Awfulhak.org>, <brian@FreeBSD.org>, <bri@OpenBSD.org>
      <http://www.Awfulhak.org>
Don't _EVER_ lose your sense of humour....