Flask-Sendmail-ng is a Flask extension providing a simple interface for the system's sendmail client.
pip install flask-sendmail-ng
Flask-sendmail-ng is a fork of Flask-Sendmail, a package made by @ajford to create a drop-in alternative for Flask-Mail.
This fork was necessary because the original repo was not updated for several years, and the support of Python 3 was not available.
As I need it for one of my project I decided to release a new package. You can now work with Sendmail in your Python 3 projects using it.
Online documentation is available at the original link : flask-sendmail.readthedocs.org.