I have made a new toy to send email notification when there is any new star for my GitHub repositories. It works quite fine so I have decided to list it on GitHub Marketplace and open to all to use it for free (link to GitHub Marketplace page of it: https://github.com/marketplace/star-notifier).
The stack is mainly Python + AWS services. The application itself is very simple & has most minimal permission requirement (your privacy is safe).
Give a try and let me know your feedback! Cheers.