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Look at the bottom right hand side of the page when you're logged into Gmail. You can see "Last account activity: xx minutes ago Details". Click on the "Details" link to get a list of IP address and locations of access to your account.


According to the documentation, they may include the sender IP. IP addresses can be considered sensitive information. As such, Gmail may hide sender IP address information from outgoing mail headers in some circumstances. I've experimented with it a bit, and I think it works like this: For generic gmail addresses (@gmail.com, @googlemail.com), gmail ...


I used @William's suggestion and used Wireshark to look for the IP address for Los Angeles. It showed the IP as I then checked the IP on ip-lookup.net and it said the host was speedtest1.lax1.speakeasy.net, so it looks like that's the IP you want.


Storing this in cookies/session is the way to go. In PHP you can just use the $_SESSION functionality to do this. More info on that here. This will not work if the user opens a private browsing session, though. IP tracking would work, but IP addresses change due to ISP assignments and may represent different users (for example, two users in one home sharing ...


I'll assume you're talking about received emails - and not Gmail randomly appending the header when you send emails through the web interface. The X-Originating-IP header is a "custom" header, in that it's not identified as a required field that all emails contain (compared to To, From, etc.). Many email programs and web-based mail services such as Hotmail ...


Very easy: open a proXPN account (free) and follow the instructions on their support site on how to set up your iPhone. This will hide your real IP.

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