I got a Celestial Steed in my mail...

I'm not seeing a Celestial Steed registered to this account, or in the mailbox for any of the characters on the account you are currently posting from, Feralizer.

Which character exactly does it appear this mount was sent to?

Q u o t e:
I believe he may mean it's still in his email inbox as a gift, but not registered yet.

<.<
>.>

I guess that would make sense. ;)

If this is indeed the case, Feralizer, and you received an e-mail with a code for a Celestial steed in it, then please approach it with caution. If it is a legitimate email it should provide you with a redeemable code that can be added to your account by logging into the Battle.net Account Management site (http://us.battle.net/account/), and selecting the option for "Item Code Redemption" listed under manage my games.

Unfortunately, if this item was truly gifted to you, I do not believe there is a way to see who sent it unless they were to contact you directly.