What is mail header?

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<seo title="What is mail header" metakeywords="what is mail header,email header,read header,e-mail header,send mail" metadescription="What is mail header" />
 
<seo title="What is mail header" metakeywords="what is mail header,email header,read header,e-mail header,send mail" metadescription="What is mail header" />
  
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<br>
 
<div align=justify>All of us regularly send mails. We just enter the text and click 'Send'. But do you know that emails consist not only of the text? Each email consists of 2 parts:
 
<div align=justify>All of us regularly send mails. We just enter the text and click 'Send'. But do you know that emails consist not only of the text? Each email consists of 2 parts:
  
* Email Body
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* ''email body;''
* Email Header
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* ''email header''
  
 
Email body is the message itself, i.e. the text you enter into the body field.
 
Email body is the message itself, i.e. the text you enter into the body field.
Email Header contains fields that identify particular routing information of the message, including the sender, recipient, date and subject.
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Email header contains fields that identify particular routing information of the message, including the sender, recipient, date and subject.
  
 
'''Note:''' many email clients don't display the header information by default.
 
'''Note:''' many email clients don't display the header information by default.
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You may ask: when I send mails I do not add any header. What is mail header? Where do they come from? How can I read headers to understand what is written there?
 
You may ask: when I send mails I do not add any header. What is mail header? Where do they come from? How can I read headers to understand what is written there?
  
Here's an example of a message header for an email sent from ''MrBrown@example.com'' to ''MrBlack@example.com''. We'll let you know how to read headers:
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Here's an example of a message header for an email sent from ''MrBrown@myidealhost.com'' to ''MrBlack@myidealhost.com''. We'll let you know how to read headers:
  
    Delivered-To: MrBlack@example.com
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Delivered-To: MrBlack@myidealhost.com
    Received: by 10.36.81.3 with SMTP1 id e3cs239nzb;  
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Received: by 10.36.81.3 with SMTP1 id e3cs239nzb;  
    Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
    Return-Path:
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Return-Path:
    Received: from mail.example.com (mail.example.com [111.111.11.111])  
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Received: from mail.myidealhost.com  
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(mail.myidealhost.com [111.111.11.111])  
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by mx.myidealhost.com with SMTP
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id h19si826631rnb.2005.03.29.15.11.46;
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Message-ID: <20050329231145.62086.mail@mail.myidealhost.com>
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Received: from [11.11.111.111] by mail.myidealhost.com via HTTP;
  
    by mx.example.com with SMTP id h19si826631rnb.2005.03.29.15.11.46; Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Tue, 29 Mar 2005 15:11:45 PST
    Message-ID: <20050329231145.62086.mail@mail.example.com>
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Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
    Received: from [11.11.111.111] by mail.example.com via HTTP;
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From: Mr Jones
 
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Subject: Hello
Tue, 29 Mar 2005 15:11:45 PST
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To: Mr Smith
    Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
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    From: Mr Jones
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    Subject: Hello
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    To: Mr Smith
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In the example, headers are added to the message three times:
 
In the example, headers are added to the message three times:
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''When Mr. Brown composes the email''
 
''When Mr. Brown composes the email''
  
        Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
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Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
        From: Mr Brown
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From: Mr Brown
        Subject: Hello
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Subject: Hello
        To: Mr Black
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To: Mr Black
 
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''Mr. Brown sends email through his email provider, mail.example.com''
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        Message-ID: <20050329231145.62086.mail@mail.example.com>
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''Mr. Brown sends email through his email provider, mail.myidealhost.com''
        Received: from [11.11.111.111] by mail.example.com via HTTP;
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Tue, 29 Mar 2005 15:11:45 PST
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Message-ID: <20050329231145.62086.mail@mail.myidealhost.com>
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Received: from [11.11.111.111] by mail.myidealhost.com via HTTP;
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Tue, 29 Mar 2005 15:11:45 PST
  
 
''When the message transfers from Mr. Brown's email provider to Mr. Black's example address''
 
''When the message transfers from Mr. Brown's email provider to Mr. Black's example address''
  
        Delivered-To: MrBlack@example.com
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Delivered-To: MrBlack@myidealhost.com
        Received: by 10.36.81.3 with SMTP id e3cs239nzb;Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Received: by 10.36.81.3 with SMTP id e3cs239nzb;
        Return-Path: MrBrown@example.com
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
        Received: from mail.example.com (mail.example.com [111.111.11.111]) by mx.example.com with SMTP id h19si826631rnb; Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Return-Path: MrBrown@myidealhost.com
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Received: from mail.myidealhost.com (mail.myidealhost.com  
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([111.111.11.111])  
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by mx.myidealhost.com with SMTP id h19si826631rnb;  
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
  
  
 
Below is a description of each section of the email header:
 
Below is a description of each section of the email header:
  
Delivered-To: MrBlack@example.com
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Delivered-To: MrBlack@myidealhost.com
  
 
''The email address the message will be delivered to.''
 
''The email address the message will be delivered to.''
  
Received: by 10.36.81.3 with SMTP id e3cs239nzb;
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Received: by 10.36.81.3 with SMTP id e3cs239nzb;
Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
  
 
''The time the message reached example's servers.''
 
''The time the message reached example's servers.''
  
Return-Path:
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Return-Path:
  
 
''The address from which the message was sent.''
 
''The address from which the message was sent.''
  
Received: from mail.example.com
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Received: from mail.myidealhost.com
(mail.example.com [111.111.11.111])
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(mail.myidealhost.com [111.111.11.111])
by mx.example.com with SMTP id h19si826631rnb.2005.03.29.15.11.46;
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by mx.myidealhost.com with SMTP  
Tue, 29 Mar 2005 15:11:47 -0800 (PST)
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id h19si826631rnb.2005.03.29.15.11.46;
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Tue, 29 Mar 2005 15:11:47 -0800 (PST)
  
''The message was received from mail.example.com, by a example server on March 29, 2005 at approximately 3 pm.''
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''The message was received from mail.myidealhost.com, by a example server on March 29, 2005 at approximately 3 pm.''
  
Message-ID: 20050329231145.62086.mail@mail.example.com
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Message-ID: 20050329231145.62086.mail@mail.myidealhost.com
  
''A unique number assigned by mail.example.com to identify the message.''
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''A unique number assigned by mail.myidealhost.com to identify the message.''
  
Received: from [11.11.111.111] by mail.example.com via HTTP;
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Received: from [11.11.111.111] by mail.myidealhost.com via HTTP;
Tue, 29 Mar 2005 15:11:45 PST
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Tue, 29 Mar 2005 15:11:45 PST
  
''Mr. Brown used an email composition program to write and send the mail message, and it was then received by the email servers of mail.example.com.''
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''Mr. Brown used an email composition program to write and send the mail message, and it was then received by the email servers of mail.myidealhost.com.''
  
Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
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  Date: Tue, 29 Mar 2005 15:11:45 -0800 (PST)
From: Mr Brown
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  From: Mr Brown
Subject: Hello
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  Subject: Hello
To: Mr Black
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  To: Mr Black
  
 
''The date, sender, subject, and destination -- Mr. Brown entered this information (except for the date) when he composed the email.''</div>
 
''The date, sender, subject, and destination -- Mr. Brown entered this information (except for the date) when he composed the email.''</div>

Latest revision as of 13:39, 26 October 2012

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