Re: email lacks sender address

From	Greg Wooledge <greg@wooledge.org>
Newsgroups	linux.debian.user
Subject	Re: email lacks sender address
Date	2022-04-28 19:20 +0200
Message-ID	<EhfY5-bOOV-1@gated-at.bofh.it> (permalink)
References	(5 earlier) <EgzYR-botX-3@gated-at.bofh.it> <EgOEx-bxH5-1@gated-at.bofh.it> <EgVZn-bBWw-1@gated-at.bofh.it> <EhdMB-bNiT-7@gated-at.bofh.it> <EhfOp-bOLL-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Apr 28, 2022 at 12:02:50PM -0500, David Wright wrote:
> $ cat /etc/mailname 
> acer.corp1
> $ cat /etc/hosts 
> 127.0.0.1       localhost
> 127.0.1.1       acer1.corp      acer1
> 192.168.1.14    axis.corp       axis
> 
> # The following lines are desirable for IPv6 capable hosts
> ::1     localhost ip6-localhost ip6-loopback
> ff02::1 ip6-allnodes
> ff02::2 ip6-allrouters
> $ hostname
> acer

But you no longer have 'acer' in your /etc/hosts file.  Your hostname
therefore won't have *any* canonical form with dots in it.

> $ domainname
> (none)

That's an NIS command.  It's used by NIS only.  It has nothing to do
with what you appear to think a "domain name" is.

> and here's the email on axis:
> 
> >From auser@acer.corp Thu Apr 28 11:37:06 2022
> Return-path: <auser@acer.corp>
> Envelope-to: auser@axis
> Delivery-date: Thu, 28 Apr 2022 11:37:06 -0500
> Received: from [192.168.1.10] (helo=acer)
>         by axis.corp with esmtp (Exim 4.92)
>         (envelope-from <auser@acer.corp>)
>         id 1nk78c-0001yL-Bm
>         for auser@axis; Thu, 28 Apr 2022 11:37:06 -0500
> Received: from auser by acer with local (Exim 4.94.2)
>         (envelope-from <auser@acer>)
>         id 1nk78b-0000HX-6v
>         for auser@axis; Thu, 28 Apr 2022 11:37:05 -0500

Here, you can see that there was no canonical expansion of "acer" into
a dot-laden name, so your system only identified itself as "acer".  Not
as "acer.corp" or anything similar, in its HELO.

If one of the entries in your /etc/hosts file had contained "acer" as
an alias, then the outcome would have been different.

Interestingly, acer.corp *does* appear in the envelope sender address,
which you can see in the "From " line and the "Return-path:" header.
But in the bottom Received: header, it says "envelope-from <auser@acer>".
I find that quite interesting, but you'd need more knowledge of exim
configuration than I possess to work out what happened there.

Thread

email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-24 22:10 +0200
  Re: email lacks sender address Jonathan Dowland <jon+debian-user@dow.land> - 2022-04-24 23:40 +0200
  Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-25 00:40 +0200
    Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-25 05:40 +0200
      Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-25 06:40 +0200
        Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-25 17:50 +0200
          Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-25 18:50 +0200
          Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-25 19:00 +0200
            Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-25 21:10 +0200
          Re: email lacks sender address Jonathan Dowland <jon+debian-user@dow.land> - 2022-04-26 11:20 +0200
            Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-26 15:30 +0200
              Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-26 17:10 +0200
              Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-26 22:30 +0200
                Re: email lacks sender address Curt <curty@free.fr> - 2022-04-27 11:30 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 11:50 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 14:10 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 14:30 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 16:40 +0200
                Re: email lacks sender address Jonathan Dowland <jon+debian-user@dow.land> - 2022-04-27 18:20 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 23:00 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-27 14:50 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 15:40 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 16:30 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 16:50 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 17:00 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 17:30 +0200
                Re: email lacks sender address <tomas@tuxteam.de> - 2022-04-27 15:40 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-27 16:40 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 17:10 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 17:30 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-27 18:10 +0200
                Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 19:50 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 20:40 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 23:50 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-27 21:10 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 23:00 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 22:50 +0200
                Re: email lacks sender address <tomas@tuxteam.de> - 2022-04-28 07:00 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 16:20 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-27 20:30 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 21:40 +0200
                Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 23:30 +0200
                Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-27 22:00 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-27 22:30 +0200
                Re: email lacks sender address Brian <ad44@cityscape.co.uk> - 2022-04-28 17:00 +0200
                Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-28 19:10 +0200
                Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-28 19:20 +0200
                Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-29 01:50 +0200
          Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-27 17:20 +0200
            Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-27 17:30 +0200
      Re: email lacks sender address Curt <curty@free.fr> - 2022-04-25 14:10 +0200
        Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-25 16:20 +0200
          Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-25 16:30 +0200
            Re: email lacks sender address David Wright <deblis@lionunicorn.co.uk> - 2022-04-25 17:10 +0200
          Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-25 16:40 +0200
      Re: email lacks sender address Vincent Lefevre <vincent@vinc17.net> - 2022-04-26 17:20 +0200
        Re: email lacks sender address Curt <curty@free.fr> - 2022-04-26 17:40 +0200
  Re: email lacks sender address 황병희 <soyeomul@doraji.xyz> - 2022-04-25 03:20 +0200
    Re: email lacks sender address Jim Popovitch <jim@k4vqc.com> - 2022-04-25 03:50 +0200
      Re: email lacks sender address 황병희 <soyeomul@doraji.xyz> - 2022-04-25 06:50 +0200
    Re: email lacks sender address Haines Brown <haines@histomat.net> - 2022-04-25 05:40 +0200
      Re: email lacks sender address 황병희 <soyeomul@doraji.xyz> - 2022-04-25 07:00 +0200
      Re: email lacks sender address Greg Wooledge <greg@wooledge.org> - 2022-04-25 14:50 +0200
        Re: email lacks sender address 황병희 <soyeomul@doraji.xyz> - 2022-04-26 02:50 +0200
          Re: email lacks sender address Celejar <celejar@gmail.com> - 2022-04-26 18:10 +0200
            Re: email lacks sender address Byung-Hee HWANG <soyeomul@doraji.xyz>  - 2022-04-27 03:10 +0200
              Re: email lacks sender address Byung-Hee HWANG <soyeomul@doraji.xyz>  - 2022-04-27 03:20 +0200
              Re: email lacks sender address Celejar <celejar@gmail.com> - 2022-04-27 17:30 +0200
                Re: email lacks sender address Byung-Hee HWANG <soyeomul@doraji.xyz>  - 2022-04-27 20:40 +0200
                Re: email lacks sender address (SOLVED) Haines Brown <haines@histomat.net> - 2022-05-08 18:10 +0200
                Re: email lacks sender address (SOLVED) Charles Curley <charlescurley@charlescurley.com> - 2022-05-08 19:10 +0200
                Re: email lacks sender address (SOLVED) David Wright <deblis@lionunicorn.co.uk> - 2022-05-09 02:50 +0200
                Re: email lacks sender address (SOLVED) Charles Curley <charlescurley@charlescurley.com> - 2022-05-09 03:30 +0200
                Re: email lacks sender address (SOLVED) David Wright <deblis@lionunicorn.co.uk> - 2022-05-09 04:40 +0200

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