View the full header of an email

Full headers can help identify who really sent an email, as well as the source of a delayed email. Here's how to view the full header information in Yahoo Mail.


Viewing the full header

Only a brief header is displayed by default.

  1. Open an email.
  2. Click More View Full Header.
    - The full header opens.

Differences between brief and full headers

  • Brief headers - contain the sender's address, the recipient address(es), the subject, and the time received.
  • Full headers - contain detailed information about who sent the email, to whom it was sent, and the route the email traveled on the Internet.

While it's possible for a sender to forge false information in the brief headers, you can obtain the true information from the full headers. 

+Brief header example

An example of a brief header sent from InfoBeat (http://www.infobeat.com):

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From: InfoBeat  Add to Address Book
To: ****@yahoo.com
Subject: Finance - Full Closing Bell @ 08/20/97 (1 stories)
Date: Wed, 20 Aug 1997 17:43:03 MDT

+Full header example

An example of a full header sent from InfoBeat (http://www.infobeat.com):

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From cbell-errors@mx.lodo.infobeat.com Mon Mar 24 15:29:00 1997
Return-Path: cbell-errors@mx.lodo.infobeat.com
Received: from key-colony.merc.com (key-colony.merc.com [207.79.9.133\) by mta0.yahoomail.com (8.0.5/8.6.12) with ESMTP id AX08764 for <****@yahoomail.com>; Mon, 24 Mar 1997 15:28:59 -0800 (PST)
Received: from tahiti.prod.merc.com (cbell-errors@mx.lodo.merc.com) by tahiti.prod.merc.com (version 3.23, queueup copyright InfoBeat, Inc. 1996,1997) with stdio id AAJVI18872; Mon, 24 Mar 1997 16:30:23 MST
Message-Id: <******@tahiti.merc.com>
To: ****@yahoo.com
Subject: Finance - Full Closing Bell @ 08/20/97 (1 stories)
MIME-Version: 1.0
Content-Type: text/html
From: InfoBeat  Add to Address Book
Priority: normal
Errors-To: finance-errors@mx.lodo.infobeat.com
Date: Wed, 20 Aug 1997 17:43:03 MDT
Content-Length: ****
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