Finding IP address in Gmail
Received: from [188.8.131.52] by web31804.mail.mud.yahoo.com
Log into your Gmail account with your username and password.
*Open the mail.
*To display the email headers,
*Click on the inverted triangle beside Reply. Select Show Orginal.
*Look for Received: from followed by the IP address between square brackets [ ].
*If you find more than one Received: from patterns, select the last one.