From the official Hellgate: London site:
"This patch is has some major skill changes, a few vital balance tweaks, some pesky bug fixes, and a highly-requested new feature.
First and foremost is the introduction of our in-game mail system. This is something that we know is of vital interest to our community, and is the foundation for our consignment / auction house system. Players can not only send and receive messages with anyone in the game, but they can also attach Palladium and items to their mail. This makes getting items from one character to another – even your own – much simpler and more convenient. And while you need to be in a Station to attach or receive items and Palladium, you can read your messages anywhere, anytime."