I just found this email while cleaning out an old account. I think this is the oldest record I have. It's been a few days...
Discussion
Beat me by a few months!
Funny, just the other day I did something similar and checked what old mails I could find.
Guess I trashed the MtGox account-creation mail, but I found the verification mail.
But MtGox wasn't my first BTC-exchange, that was BitMarket.eu about 1 year earlier.
It's been a fun rollercoaster ride so far and it only gets better over time.