So this is a rather nifty addition, isn’t it? If you’re like to really wind up the people you’re emailing (or, hugely annoy your boss), you can have Google automatically do a lookup on your current IP location and stick that in your footer.
It’s only for Gmail at the moment. That’s Gmail on the desktop. I doubt it works for mobile… although that would be an interesting experiment to try out.
Although I wonder at what point will it become highly unnecessary for anyone to actually tell you where they are. You’ll just know. It’ll be built straight into your mobile messaging console in the future. Right?
Maybe in about 100 years…
More details from the Gmail Blog here.