I used to get odd messages from ATTMAIL.COM as well (even though my list
EMED-L runs on Majordomo, not LISTSERV). Even some of my subscribers
would get these messages!
 
When I reviewed the list of subscribers to EMED-L, I noticed that a few had
addresses like
        [log in to unmask]
(Domain hghed has a UUCP mail-only feed from netcom.com.) When these were
all changed to the equivalent
        [log in to unmask]
all the ATTMAIL error messages stopped. I think someone's UUCP mail
program is not coping well with the address of mail not bound for its system.
 
Dave English
[log in to unmask]
 
 On Thu, 21 Jul 1994, Anita Cohen-Williams wrote:
 
>       Why am I getting this odd message? The address given is not on my list
> of subscribers.
>
> Anita Cohen-Williams; Reference Services; Hayden Library
> Arizona State University, Tempe, AZ  85287-1006
> PHONE: (602) 965-4579              FAX: (602) 965-9169
> INTERNET: [log in to unmask] Owner: HISTARCH
> *** Forwarding note from UUCP    --CMSNAMES 07/21/94 00:53 ***
> Return-Path: <@ASUVM.INRE.ASU.EDU:[log in to unmask]>
> Received: from ASUACAD (NJE origin SMTP@ASUACAD) by ASUVM.INRE.ASU.EDU (LMail
>           V1.1d/1.7f) with BSMTP id 2655; Thu, 21 Jul 1994 00:53:08 -0700
> Received: from gw1.att.com by ASUVM.INRE.ASU.EDU (IBM VM SMTP V2R2) with TCP;
>    Thu, 21 Jul 94 00:53:05 MST
> From: [log in to unmask]
> Date: 21 Jul 94 07:55:00 GMT
> To: [log in to unmask]
> Report-Version: 3
> Received: from  by /C=US/AD=ATTMAIL;Thu Jul 21 07:51:22 -0000 1994
> Received: by /C=US/AD=ATTMAIL/PD=USDA.FS.X400;Thu Jul 21 07:55:00 GMT 1994
> Confirming-MTS-Message-ID: </C=US/AD=ATTMAIL;internet2020656510>
> Confirming-UA-Content-ID: <0qQs3d.1gi-l.com>
> Not-Delivered-To: mhs!fswa/S=I.RITCHIE/OU1=R06F05D06A/RECIPNUM=5/MTA-BASIC due
>  to code 01 "Invalid Address Specification";
>         arrived Thu Jul 21 07:55:00 GMT 1994;
>         Supplementary-Info "DG 78043: (X400) Routing loop detected"
> Content-Type: text