The email is real. My customer forwarded me this email too. I called Adobe support on his behalf and they have told me 3 times that in my case the subscription is valid till April 15th, 2021 and by their records nothing will happen after November 15th. So, I am awaiting for November 15-16th to see, whether there will be any change or not. Since they confirmed me that this email has been sent by their system to my client email address. So ya, I've stopped buying Adobe codes until November 16th.