Know the ip of a person on gmail

Know the ip of a person on gmail
1. Using your id/password, login to Gmail.
2. Open the mail for which you wish to find the IP of the sender.
3. Click on the inverted triangle placed just next to Reply. Click on Show Original
4. You now need to look for Received:from followed by the IP within square brackets [ ] e.g. Received: from ge3.i-nonymous.com (ge3.i-nonymous.com [82.96.97.51])
5. Also importantly, there are times when you might find multiple Received: from entries, in that case, please select the last one as the valid choice.

Similarly, IP Address of the sender can be tracked in Yahoo Mail and Hotmail as well.

Note: This trick wont work on mails sent from Gmail.