From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed,  5 Nov 2014 19:19:20 +0100
From: Steffen Nurpmeso <sdaoden@yandex.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Message-ID: <20141105181920.r9S5I4BQ%sdaoden@yandex.com>
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In-Reply-To: <9C58B6D5-AD15-4F4B-AF15-367BC37EE61B@9srv.net>
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Subject: Re: [9fans] Setting up Mail in Acme on the Raspberry Pi.
Topicbox-Message-UUID: 233d1936-ead9-11e9-9d60-3106f5b1d025

Anthony Sorace <a@9srv.net> wrote:
 |> I've been looking through the documentation and
 |> the 9fans archive but I can't get a clear answer on
 |> what to replace localhost.localdomain with.
 |
 |If the recipient's mail server is being strict (but within
 |the bounds of the RFCs), that name is expected to be
 |the real, externally-resolvable DNS name of the
 |system you're sending from. The RFCs used to be more
 |lax on that point, and some servers still are, but you
 |shouldn't assume you'll be able to send to arbitrary
 |endpoints unless you satisfy that.

gmail.com shouldn't care at all, so it must be his own SMTP server.
(All i know in respect to this is Yandex.(ru|com), which requires
that the hostname in the SMTP FROM:<> command _is_ a Yandex
address, i.e., _no mismatch_ with _who_ you claim to be, which is
why i had to invent a *smtp-hostname* variable for the mailer
i maintain in order to address the SMTP FROM:<> content directly:

  |?0[steffen@sherwood nail.git]$ echo bla|s-nail -vvdAsn_sf -s du test@bo.org
  |>>> EHLO yandex.com
  |>>> AUTH PLAIN
  |>>> ...
  |>>> MAIL FROM:<sdaoden@yandex.com>
  |>>> RCPT TO:<test@bo.org>
  |>>> DATA
  |>>> Date: Wed, 05 Nov 2014 19:11:33 +0100
  |>>> From: sdaoden@users.sf.net (Steffen Nurpmeso)
  |>>> To: test@bo.org
  |>>> Subject: du
  |>>> Message-ID: <20141105181133.J3jtD1IU%sdaoden@yandex.com>
  |>>> User-Agent: s-nail v14.7.8-70-g9310369
  |>>> MIME-Version: 1.0
  |>>> Content-Type: text/plain; charset=US-ASCII
  |>>> Content-Transfer-Encoding: 7bit
  |>>>
  |>>> bla
  |>>> .
  |>>> QUIT

  |?0[steffen@sherwood nail.git]$ echo bla|s-nail -vvdAsn_gm -s du test@bo.org
  |>>> EHLO gmail.com
  |>>> STARTTLS
  |>>> EHLO gmail.com
  |>>> AUTH PLAIN
  |>>> ...
  |>>> MAIL FROM:<sdaoden@gmail.com>
  |>>> RCPT TO:<test@bo.org>
  |>>> DATA
  |>>> Date: Wed, 05 Nov 2014 19:11:45 +0100
  |>>> From: Steffen Nurpmeso <sdaoden@gmail.com>
  |>>> To: test@bo.org
  |>>> Subject: du
  |>>> Message-ID: <20141105181145.kUn5Nikj%sdaoden@gmail.com>
  |>>> User-Agent: s-nail v14.7.8-70-g9310369
  |>>> MIME-Version: 1.0
  |>>> Content-Type: text/plain; charset=US-ASCII
  |>>> Content-Transfer-Encoding: 7bit
  |>>>
  |>>> bla
  |>>> .
  |>>> QUIT)

--steffen