The only email I have:

Preorder serial number xxxxxx-xxx-xxxxxx-xxx


FINAL FANTASY XIV: A Realm Reborn Collector's Edition [PC DOWNLOAD]
PC Digital Download
Electronic Download
1
FINAL FANTASY XIV: Collector’s Edition Exclusive In-game Items
PC Download
Other
1
FINAL FANTASY XIV: A Realm Reborn Pre-Order Bonus Package

Save file Final_Fantasy_XIV_Early_Access_Instructions.pdf to your Desktop. After saving, run the file to install your new software.
Serial Number: xxxxxx-xxx-xxxxxx-xxx
Electronic Download
Instructions to sign up for early access to the game:

Visit http://preorder.na.finalfantasyxiv.com and register. You will be notified via email prior to the launch of the game on when you can return and redeem your preorder code to unlock Early Access to the game along with instructions on how to receive your Cait Sith Doll minion and Moogle Cap digital content.

You will need an active Square Enix account to complete this process so, if you want to set one up in advance, please go here: http://na.square-enix.com/members.