I just got this message from Google. As I understand it, beginning in July the email subscription/notification feature will no longer work. As a result, readers who use that feature will need to adjust:
FollowByEmail widget (Feedburner) is going away
You are receiving this information because your blog uses the FollowByEmail widget (Feedburner).
Recently, the Feedburner team released a system update announcement , that the email subscription service will be discontinued in July 2021.
After July 2021, your feed will still continue to work, but the automated emails to your subscribers will no longer be supported. If you’d like to continue sending emails, you can download your subscriber contacts. Learn how
I haven't read further or "Learned How," so I'm not sure how or whether I'll address this