How to view header information of a Yahoo email? I want to know more about an email, like from which IP address it come from.

If you are using the Yahoo mail new interface as of 2015, you can view the full header of an email with these steps:

1. Open the email.

2. Click the "More" menu above the email and select View Full Header. The full header appears. It contains detailed information about who sent the email, to whom it was sent, and the route the email traveled on the Internet.

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

From cbell-errors@mx.lodo.infobeat.com Mon Mar 24 15:29:00 2015
Return-Path:    cbell-errors@mx.lodo.infobeat.com
Received:       from key-colony.merc.com (key-colony.merc.com [207.79.9.133\) by
Received:       from tahiti.prod.merc.com (cbell-errors@mx.lodo.merc.com) by tah
Message-Id:     <******@tahiti.merc.com>
To:             ****@yahoo.com
Subject:        Finance - Full Closing Bell @ 08/20/15 (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: ****