Finding IP Address of the sender in Yahoo Mail

*Log into your Yahoo! mail with your username and password.
*Click on Inbox or whichever folder you have stored your mail.
*Open the mail.
*If you do not see the headers above the mail message, your headers are not displayed . To display the headers,
*Click on Options on the top-right corner
*In the Mail Options page, click on General Preferences
*Scroll down to Messages where you have the Headers option
*Make sure that Show all headers on incoming messages is selected
*Click on the Save button
*Go back to the mails and open that mail.
*You should see similar headers like this:
Yahoo! headers : Daniel.
*Look for Received: from followed by the IP address between square brackets [ ].
Here, it is 202.65.138.109.
That is be the IP address of the sender!