WelcomeThis site is still under developement, so don't be surprised if something changes or doesn't work how it is supposed to be.
At the moment you can find a list of GeoPostOffices at the corresponding menulink. There you also have the ability to add new GPO-entries.
In the future there will be a functionality to track your travel-mail... for free
Please consider to use the GeoPostOffice-GreaseMonkey-Script, it marks known GPOs on geocaching.com and adds an link to automatically add new entries to our GeoPostOffice-list: GPO-Greasemonkey-Script