Returned mail: Host unknown (Name server: mail.s-bit.net.: host not found)

[Mail Delivery Subsystem <address@hidden>]

The original message was received at Sun, 2 Dec 2001 20:23:29 -0500 (EST)
from root@localhost

   ----- The following addresses had permanent fatal errors -----
David Simmons <David.Simmons@smallscript.com>
    (expanded from: include)

   ----- Transcript of session follows -----
Receiving 1
mj_digest: ABORT
open(MSG, ">/var/spool/majordomo/digest/ll1-discuss-digest/001"): No such file or directory
550 David Simmons <David.Simmons@smallscript.com>... Host unknown (Name server: mail.s-bit.net.: host not found)
Reporting-MTA: dns; life.ai.mit.edu
Arrival-Date: Sun, 2 Dec 2001 20:23:29 -0500 (EST)

Final-Recipient: RFC822; tower@life.ai.mit.edu
X-Actual-Recipient: RFC822; David.Simmons@smallscript.net
Action: failed
Status: 5.1.2
Remote-MTA: DNS; mail.s-bit.net
Last-Attempt-Date: Sun, 2 Dec 2001 20:28:07 -0500 (EST)
Return-Path: <owner-ll1-discuss@ai.mit.edu>
Received: (from root@localhost)
	by life.ai.mit.edu (8.9.3/8.9.3/AI2.13/ai.master.life:2.21) id UAA01333
	for ll1-discuss-outgoing; Sun, 2 Dec 2001 20:23:29 -0500 (EST)
Received: from mineshaft.odi.com (mineshaft.odi.com [198.3.16.17])
	by life.ai.mit.edu (8.9.3/8.9.3/AI2.13/ai.master.life:2.21) with ESMTP id UAA01325
	for <ll1-discuss@ai.mit.edu>; Sun, 2 Dec 2001 20:23:28 -0500 (EST)
Received: from blizzard.odi.com (blizzard [198.3.23.25])
	by mineshaft.odi.com (8.8.8/EX3.9) with ESMTP id UAA16439;
	Sun, 2 Dec 2001 20:22:14 -0500 (EST)
Received: from handcuff.odi.com (handcuff [198.3.23.20])
	by blizzard.odi.com (8.8.8/IN3.8) with ESMTP id UAA00638;
	Sun, 2 Dec 2001 20:22:51 -0500 (EST)
Received: (from dlw@localhost)
	by handcuff.odi.com (8.8.8/CL3.1) id UAA19292;
	Sun, 2 Dec 2001 20:20:18 -0500 (EST)
Date: Sun, 2 Dec 2001 20:20:18 -0500 (EST)
Message-Id: <200112030120.UAA19292@handcuff.odi.com>
From: Dan Weinreb <dlw@exceloncorp.com>
To: steele@cs.brandeis.edu
CC: ll1-discuss@ai.mit.edu
In-reply-to: <010901c17b73$7e9739e0$0f01000a@gatewaysolo>
	(steele@cs.brandeis.edu)
Subject: Re: Dylan (was: ARC)
Reply-to: "Dan Weinreb" <dlw@exceloncorp.com>
Sender: owner-ll1-discuss@ai.mit.edu
Precedence: bulk