Finding an Email Sender’s IP Address
You can find the IP address of the person who sent you an email in several different ways. The most obvious is via your email client, and of course the steps differ as you try this on different software.
In Outlook 2010, for instance, you need to open the message in its own window, then click File > Info > Properties – the Internet headers are displayed at the bottom of the window, with the IP address of the sender listed quite prominently.
For older versions of Outlook, open the message and select View > Options to find the Internet headers.
For Gmail users accessing messages in the web browser, the header details can be found by opening the message and clicking the down-facing triangle next to the reply button; a menu is revealed, from where you will be able to select Show original to open the raw text emailing in a new window, with the sender’s IP address listed. Check out the detailed instructions for finding the the IP Address in Gmail here.
Finally, in Windows Live you can find the sender’s IP by right-clicking the message, selecting View source and checking the first 10 lines of the header.