In its varied incarnations, NetHack has been around for over 15 years...and new versions are still being released!
Some scroll names in NetHack mean something when read backwards (e.g. "ELBIB YLOH", "DUAM XNAHT"), but "KIRJE" just means "letter" in Finnish.
NetHack is one of the few computer games where you can actually produce offspring. By polymorphing into a female snake, dragon, or other appropriate monster, you can lay eggs. Just be sure to have fire resistance once your baby dragon starts breathing fire...
Among the this game's many features, you're able to receive e-mail within the game.