Hi all !

When we see an email in a ordinary text editor, we can see many lines which 
are NOT seen while reading an email in inbox. Such email text is shown below:

-------------------------------------------start---------------
X-Apparently-To: a...@b.com via 217.146.176.79; Mon, 15 Nov 2010 06:03:11 +0000
($1)Received-SPF: pass (mta1054.mail.ukl.yahoo.com: domain of 
linux-india-help-boun...@lists.sourceforge.net designates 216.34.181.88 as 
permitted sender)
($2)X-YMailISG: A7RztcQcZAqpKTabN_3uPw4jJO7WjGixi8UTH3Oq3b6OTrW4
 lLQuY.mclWAYCLaAgtEZC3gy0ceznAqS5uYUMlRREE3aAXPlLXUkGZ40JKxR
.....
.....
( here there are many garbage char lines..which I deleted)
0ghGxxCEQjSZ8U-
($3)X-Originating-IP: [216.34.181.88]
($4)Authentication-Results: mta1054.mail.ukl.yahoo.com  from=yahoo.co.uk; 
omainkeys=neutral (no sig);  from=yahoo.co.uk; dkim=neutral (no sig)
($5)Received: from 127.0.0.1  (EHLO lists.sourceforge.net) (216.34.181.88)
  by mta1054.mail.ukl.yahoo.com with SMTP; Mon, 15 Nov 2010 06:03:11 +0000
($6)Received: from localhost ([127.0.0.1] 
helo=sfs-ml-2.v29.ch3.sourceforge.com)
        by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.69)
        (envelope-from <linux-india-help-boun...@lists.sourceforge.net>)
        id 1PHs9G-0003mB-28; Mon, 15 Nov 2010 06:02:38 +0000
Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194]
        helo=mx.sourceforge.net)
        by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.69)
        (envelope-from <a...@b.com>) id 1PHs9E-0003m4-6u
        for linux-india-help@lists.sourceforge.net;
        Mon, 15 Nov 2010 06:02:36 +0000
Received: from nm2.bullet.mail.ukl.yahoo.com ([217.146.183.219])
        by sog-mx-4.v43.ch3.sourceforge.com with smtp (Exim 4.69)
        id 1PHs9B-00078c-Qs for linux-india-help@lists.sourceforge.net;
        Mon, 15 Nov 2010 06:02:36 +0000
Received: from [217.146.183.182] by nm2.bullet.mail.ukl.yahoo.com with NNFMP;
        15 Nov 2010 06:02:27 -0000
Received: from [77.238.184.53] by tm13.bullet.mail.ukl.yahoo.com with NNFMP;
        15 Nov 2010 06:02:27 -0000
Received: from [127.0.0.1] by smtp122.mail.ukl.yahoo.com with NNFMP;
        15 Nov 2010 06:02:27 -0000
($7)X-Yahoo-Newman-Id: 859197.90164...@smtp122.mail.ukl.yahoo.com
Received: from 117.98.64.7 (a...@117.98.64.7 with login)
        by smtp122.mail.ukl.yahoo.com with SMTP; 14 Nov 2010 22:02:19 -0800 PST
($8)X-Yahoo-SMTP: zABoprWswBAVwYsHhm_t3sWar_XU
($9)X-YMail-OSG: Fn4Kr_gVM1miLHK19zk273DBYWMLO3kxPNUo2M87lpS4D5.
        LB19qMeJG6qesK.YhSXb5bOVhUbCt50LSnvDM4jJhyV.rdb7TKm41qt53typ
        D7zlgniIFhivl3Y_4Ne9V24FUh1RgzMjRgoRXCEZmsV7jUFll7zGvNpzcJgX
        hqn.T3Ek83CUNxKZQPJvNTOQucCzbP7VtIDrpJ.N9PcqIiiZjEyKiBExSXW9
        Rsl0QyDOm5Vg-
From: <a...@b.com
To: linux-india-help@lists.sourceforge.net
Date: Mon, 15 Nov 2010 03:24:10 +0100
User-Agent: KMail/1.5.1
MIME-Version: 1.0
($10)Content-Disposition: inline
Message-Id: <201011150324.1415...@b.com>
($11)X-Spam-Score: 1.0 (+)
($12)X-Spam-Report: Spam Filtering performed by mx.sourceforge.net.
        See http://spamassassin.org/tag/ for more details.
        0.0 FREEMAIL_FROM Sender email is freemail (a[at]yahoo.co.uk)
        -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,
        low trust [217.146.183.219 listed in list.dnswl.org]
        1.1 DATE_IN_PAST_03_06 Date: is 3 to 6 hours before Received: date
        -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from
        author's domain
        0.1 DKIM_SIGNED            Message has a DKIM or DK signature,
        not necessarily valid
        -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
        0.0 T_TO_NO_BRKTS_FREEMAIL T_TO_NO_BRKTS_FREEMAIL
X-Headers-End: 1PHs9B-00078c-Qs
Subject: Re: [LIH] Bla..Bla..Bla...
($13)X-BeenThere: linux-india-help@lists.sourceforge.net
X-Mailman-Version: 2.1.9
Precedence: list
Reply-To: a...@b.com,
 Technical list for helping people with installation and
 ( some lines deleted by me...)
...
...
        
<mailto:linux-india-help-requ...@lists.sourceforge.net?subject=subscribe>
Content-Type: text/plain;
  charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: linux-india-help-boun...@lists.sourceforge.net
($14)Status: R
($15)X-Status: N
($16)X-KMail-EncryptionState:
($17)X-KMail-SignatureState:

On Mon, 2010-11-15 at 04:19, xyz wrote:
....
....
( lines deleted..)

---------------------------End--------------------

I am just curious what is the actual meaning of many words / lines in the 
above email text. I have put ($1) , ($2) .. etc symbols in the begining of 
some lines. I will be greatful if someone can tell me the actual meaning 
behind those words or lines , in simple newbee language ! :)

($1) What is the meaning of `Received-SPF: pass` in this line ?
($2) `X-YMailISG:` ?
($3) `X-Originating-IP:` ?
($4) `Authentication-Results:` ?
($5) `domainkeys=neutral (no sig)`?  `dkim=neutral (no sig)` ?
($5), ($6) etc all Recieved... lines must be the route thru which this email 
might have travelled, I think !
     (If wrong , pl correct me..)
($7) `X-Yahoo-Newman-Id` ?
($8) `X-Yahoo-SMTP:` ?
($9) `X-YMail-OSG:` ? ( Long form of OSG ? )
($10) `Content-Disposition: inline` ?
($11) `X-Spam-Score: 1.0 (+)` ?
($12) `X-Spam-Report: ?
      ` freemail` ?
      `RCVD_IN_DNSWL_NONE RBL:` ?
      `low trust` ?
      `DATE_IN_PAST_03_06 Date: is 3 to 6 hours before Received: date` ?
      `DKIM_VALID_AU Message has a valid DKIM or DK signature from author's 
domain ?`
      `DKIM_SIGNED Message has a DKIM or DK signature,  not necessarily valid`?
      `DKIM_VALID Message has at least one valid DKIM or DK signature`?
      `T_TO_NO_BRKTS_FREEMAIL T_TO_NO_BRKTS_FREEMAIL`?
($13) `X-BeenThere:`?
      `Precedence: list`?
($14) `Status: R`?
($15) `X-Status: N`?
($16) `X-KMail-EncryptionState:`?
($17) `X-KMail-SignatureState:`?

Thnks !

~Pats


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