On 15/05/2010 20:12, Keith Edmunds wrote:
> On Sat, 15 May 2010 16:06:08 +0100, dee@??? said:
>
>>> Looking at the headers of mails you receive from the list should
>>> usually tell you which email address the email was sent to.
>>
>> I was going to suggest that but checking mine, it was only my server
>> that mentioned it in it's received header.
>
> Mail sent to you will have the mailbox it is sent to _somewhere_ in the
> headers (otherwise how do you suppose the mail gets to you?).
By using details that are not passed as part of the headers.
The SMTP protocol specifies a envelope to, from, and the data.
The data can be completely unrelated to who it is actually being
delivered to or from.
From your email (irrelevant headers stripped):
====================================================
Return-Path: <hampshire-bounces@???>
Received: from mailman.lug.org.uk (mailman.lug.org.uk [217.147.93.71])
by jane.earlsoft.co.uk (8.13.8/8.13.8) with ESMTP id o4FJCaEo006421
for <dee@???>; Sat, 15 May 2010 19:12:36 GMT
Received: from localhost ([127.0.0.1] helo=mailman.lug.org.uk)
by mailman.lug.org.uk with esmtp (Exim 4.63)
(envelope-from <hampshire-bounces@???>)
id 1ODMmo-0005dA-AC; Sat, 15 May 2010 19:12:34 +0000
Received: from mail-in-01.lug.org.uk ([217.147.93.69])
by mailman.lug.org.uk with esmtp (Exim 4.63)
(envelope-from <kae@???>) id 1ODMmm-0005d5-Mo
for hampshire@???; Sat, 15 May 2010 19:12:32 +0000
Received: from [109.224.137.78] (helo=woodlands.midnighthax.com)
by mail-in-01.lug.org.uk with esmtp (Exim 4.63)
(envelope-from <kae@???>) id 1ODMmm-0001KP-76
for hampshire@???; Sat, 15 May 2010 19:12:32 +0000
Received: from ws.in.tiger-computing.com ([10.0.0.100] ident=kae)
by woodlands.midnighthax.com with esmtp (Exim 4.69)
(envelope-from <kae@???>) id 1ODMmh-0004U9-5R
for hampshire@???; Sat, 15 May 2010 20:12:27 +0100
Date: Sat, 15 May 2010 20:12:26 +0100
From: Keith Edmunds <kae@???>
To: hampshire@???
Message-ID: <20100515201226.55a5cd63@???>
In-Reply-To: <4BEEB860.1010603@???>
References: <032801caf417$09f49710$1dddc530$@???>
<20100515131108.GX18573@???>
<4BEEB860.1010603@???>
X-Mailer: Claws Mail 3.7.4 (GTK+ 2.12.12; i686-pc-linux-gnu)
Mime-Version: 1.0
Subject: Re: [Hampshire] Test 6/6 please ignore
X-BeenThere: hampshire@???
X-Mailman-Version: 2.1.9
Precedence: list
Reply-To: Hampshire LUG Discussion List <hampshire@???>
List-Id: Hampshire LUG Discussion List <hampshire.mailman.lug.org.uk>
List-Unsubscribe: <https://mailman.lug.org.uk/mailman/listinfo/hampshire>,
<mailto:hampshire-request@mailman.lug.org.uk?subject=unsubscribe>
List-Archive: <https://mailman.lug.org.uk/mailman/private/hampshire>
List-Post: <mailto:hampshire@mailman.lug.org.uk>
List-Help: <mailto:hampshire-request@mailman.lug.org.uk?subject=help>
List-Subscribe: <https://mailman.lug.org.uk/mailman/listinfo/hampshire>,
<mailto:hampshire-request@mailman.lug.org.uk?subject=subscribe>
Sender: hampshire-bounces@???
Errors-To: hampshire-bounces@???
====================================================
(I know some of the wrapping has gone screwey)
Nowhere in the original headers does it mention my email address (the
final destination).
The email went through many servers with hampshire@??? as
the destination (see the last Received header).
Your mail client also, as a courtesy set the To: header to be the same
thing, but could just as easily be set to joe.bloggs@???. (Think
how BCC would work if it relied on the headers)
Note that once it hit mailman, the envelope to was changed to
dee@???, BUT the To: header was left untouched.
sendmail, also as a courtesy happens to log this in the Received header
but it is by no means guaranteed, and can be different for every server/MTA.
--
Dee Earley (dee@???)
irc: irc://irc.blitzed.org/
web: http://www.earlsoft.co.uk
phone: +44 (0)780 8369596
