It isn't. :)
 
There was a free utility out there that would email you when something new hit your pre-determined radius, but after some programming changes on Geocaching.com a couple of months ago, it no longer works.
 
I believe that new cache notification is a "coming-soon" feature of premium membership, though when that may be implemented remains to be seen
 
Team Cow Spots

SquishyGecko <squishygecko@yahoo.com> wrote:
So I've looked all over the website and can't figure out how you have the
site notify you immediately of new caches in your area. How is it done?


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