I got the same email and was wondering the same thing! I know where's my refund says it updates once every day usually overnight but I'm not sure how accurate that is. It still says processing when I check and its almost to the 21 days since it's been accepted and sent to the irs. I got the email Tuesday morning saying my refund is on its way and congratulations for securing my refund and to find out when its arriving, it's all so confusing, idk who to believe.
