A simple flask app that handles the sign up to a newsletter with double opt-in function.
Demo: https://daily-wiki-newsletter.herokuapp.com/
Users can signup with their email adress and select the language of the wikipedia article of the day.
After they have confirmed their email, they are subscribed to the newsletter.
A daily cron job will run sendmail.py. This will scrape the wikipedia article of the day in the selected language to the email list in Firebase.
The Cloud Firestore Data Structure for the emails:
