There's been too many forum hosts and whatnot for any of my oldest to survive, but the earliest I still have dates back to 2006, about 3 years into my time here. It was from a user named Venae Rell, asking something about the Enkidukai language. I apparently responded with some useful lore information, but the sent message wasn't preserved.
Then a few days later, a message from ThomPhoenix thanking me for joining some contest? xP Who knows, it's all lost to the mists of time.