As Super Mystery Dungeon just released, doesn't mean the other Mystery Dungeons wont be played by some members of this forum. (I still have yet to get the game)
The rescue/wonder mail passwords still work regardless because it doesn't require internet connection, applies for Red/Blue Rescue team, Explorers of Time/Darkness/Sky as the DS (and Wii) Wi-Fi connection's been shutdown since may last year.
If you've been killed in a dungeon and you seek rescue to prevent yourself from losing the items and Money, then there should be a thread for that.