STRUCTURE of a MESSAGE HEADER

each E-Mail message 
begins with a heading, which is separated from the actual message by a
blank line.  YAM produces this heading automatically due to the 
adjustments made in the configuration.  The heading
of a E-Mail message is arranged into fields.  They have the form ' 
field name:  Field ', by line ends limits.  Fields, which are too long
for a line, can be distributed over several lines.  The majority of 
the heading lines could be omitted, is however nevertheless available,
in order to supply to the Mailprogramm with of the recipient 
additional information about the message or the data necessary for the
elimination of errors with transportation problems.  On the basis the 
following example message some the important fields are explained: 

Return Path:  &#<just@zfn.uni bremen.de>

this field is added 
by the post office serveur of the recipient and contains the E-Mail 
address the sender in a form that the computer of the recipient can 
achieve the sender thereby by E-Mail. 

Received: from ina.zfn.uni bremen.de by atlantica.access.ch (8.8.5/INA-1.05pri) 
id XAA29100;  Do, 23 Dec 1997 23:40:45 +0100 (MET) 
Received: from moritz37.zfn.uni-bremen.de by ina.zfn.uni bremen.de 
(AIX 3.2/UCB 5.64/ZFNserver) id AA26355;  Do, 23 Dec 1997 23:40:13 
+0100

each computer, which serves the message on its way as 
stopover, and also the system of the recipient adds the message header
a Received field, in which is indicated, when and from which computer 
the message became to receive.  This information makes it possible to 
reconstruct for setting problems the way the message. 

From: Christian Just &#<just@zfn.uni
bremen.de>

address and possibly name of the 
sender. 

Reply to: the just@zfn.uni bremen.de

address, to which the responses to this message are to be 
sent.  If the message were sent for instance by a computer, on which 
the sender reads usually no post office, can it in this field 
indicate, where possible responses are to be sent.  If the Reply to 
field is missing, all responses go to the address indicated in the 
From field. 

To: " Marcel Beck (Yet another Mailer 
author) " &#<mbeck@access.ch>

recipient address, whereby several names are separately 
indicated as comma.  Either the field only the address in the format 
contains name@domain, or an additional comment (for example name of 
the recipient) is placed in front.  In this case the address is 
included into pointed parentheses. 

DATE: Do, 23 
Dec 1997 23:28:30 +0200

when the message one sent.  The 
specification after the time-of-day is for the time belt, which is 
indicated by the deviation from the Greenwich Mean time.  The first 
two digits are the hours, the two next Ziffen the minutes of the 
difference. 

Message Id: <yam7296.1549.122414920@zfn.uni-bremen.de>

unique indication, which is produced automatically with sending away.
  It is possible to refer unique to a certain message. 

In-Reply-to: <yam7296.263.121102896@mail.access.ch>

exact 
designation of the answered message, e.g. their Message ID. 

X-Mailer: YAM 2.0beta4 - Amiga Mailer by Marcel Beck - http://www.yam.ch

name and version of the 
Mailprogramms used by the sender. 

Subject: RH:  
YAM2beta5

this field should show briefly, for which it goes 
in the message.  The specification of a meaningful concern belongs to 
good 2.conversational language. 

MIME version: 1,0
 content transfer Encoding: quoted printable
 content type: text/plain;  charset=iso-8859-1

these fields mean that the message in the MIME
format is present.  It concerns with the example pure text in
the character set ISO-Latin-1, whereby all characters, which cannot be
represented with 7 bits (e.g. umlauts), by means of Quoted Printable 
were coded.