Greetings,

This is a legitimate email that we sent out to a small number of users who were affected by the issue. If you received the email, but have already redeemed your code and gotten the correct early access code, you're all set!
If you got this email and got the correct early access code from the start, you're all set, too!

Here is the from: noreply@email-square-enix.com
And here is the subject: FFXIV: ARR Pre-Order Code Redemption Issues

I just wanted to confirm that this is not a phishing email and it was only sent out to a small number of users.
Also, since the thread title may alarm some people, I'll be making a slight edit to it.