A mail delivery puzzle

[billhorne at attbi.com (billhorne at attbi.com)]

> On Wed, Sep 18, 2002 at 11:39:57PM -0400, Bill Horne wrote:
> > Thanks for reading this.
> > 
> > I have a ham radio domain name, namely "w1ac.ampr.org". The ampr.org domain
> > is used by ham operators to lookup addresses in the 44.0.0.0/8 space, which
> > is a semi-detached network connected via amateur packet radio.
> > 
> > Now, the problem: I have an MX record in the ampr.org dns, which points to
> > billhorne.homelinux.org, the dynamic dns domain name for my Linux firewall.
> > If I send email from either netscape.net or hotmail, to
> > <user>@w1ac.ampr.org, it gets through OK. I have set the new domain in the
> > sendmail.rc file, so sendmail knows it's supposed to take mail for
> > w1ac.ampr.org (and indeed it does, from hotmail/netscape). However, mail
> > from my attbi.com address produces an error from the attbi.com postmaster,
> > saying that "Host w1ac.ampr.org not found".
> 
> I can't find any MX records for ampr.org or w1ac.ampr.org; in fact, I
> can't find any records at all for the latter name. What do netscape.net
> and hotmail know that I don't?

Per www.samspade.org:

Registrant:
Amateur Radio Digital Communications (AMPR-DOM)
   c/o Brian Kantor
   M/S 0124
   9500 Gilman Dr
   San Diego, CA 92093-0124
   US

   Domain Name: AMPR.ORG

   Administrative Contact:
      Garbee, Bdale  (BG159) bdale at GAG.COM
      Garbee and Garbee
      4390 Darr Circle
      Black Forest, CO  80908
      US
      404 648 9798 (719) 495-2061
   Technical Contact:
      Kantor, Brian  (BK29) brian at UCSD.EDU
      Sr. Systems Analyst
      UCSD Mail Code C-024
      La Jolla, CA 92093-0124
      (619) 534-6865 (FAX) (619) 534-1746 (FAX) (619) 534-1746

   Record expires on 28-Apr-2003.
   Record created on 27-Apr-1988.
   Database last updated on 19-Sep-2002 07:20:34 EDT.

   Domain servers in listed order:

   HAMRADIO.UCSD.EDU            132.239.1.144
   TROUT.NOSC.MIL               128.49.16.7
   DNS.IARC.ORG                 192.117.122.46
   MUNNARI.OZ.AU                128.250.1.21

and an inquiry on w1ac.ampr.org:

dns w1ac.ampr.org

Mail for w1ac.ampr.org is handled by billhorne.homelinux.org 
(20) 66.31.158.55

HTH.

Bill