As far as I know you could have referred the same BNet e-mail multiple times so that the RaF invites all went to the same BNet account. Honestly, I don't even think it matters what e-mail you initially choose to send the invite to because when you click on the referral link in the e-mail, you're taken to Blizzard's site which asks if you already have an existing BNet account (which doesn't need to match the original e-mail address from the referral).
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