Q: Is there a confirmation email sent to both the person giving the gift and the person receiving the gift?
A: Yes. The e-mails Gift delivery and Gift purchase are both sent.
Q: Is it possible for a user who is getting a gift to change the email associated with their account?
A: Yes. They would be able to do it when redeeming the gift at the redemption URL. The gift recipient receives an email with a gift (redeem) link, which includes a voucher_code parameter (e.g. ?voucher_code=XZJ9QAZ).
Prior to redeeming the gift, the user should register an account, so that at this point they can register with a different email than the gift has been sent to and redeem the gift. Alternatively, the publisher is able to resend the gift/redeem email to a different gift recipient via the dashboard.