Notifications par e-mail ?

[osioke (Osioke Itseuwa)]

Check out this howto topic, it explains the inbuilt feature that sends updates to inactive users:

Configuring Activity Summary emails

This guide explains how to configure and manage activity summary emails in Discourse, including user and admin options, customization, and troubleshooting. Required user level: Administrator Activity summary emails (formerly known as digest emails) are automated messages sent to forum members who haven’t visited in a specific period. These emails contain a collection of popular content since the user’s last visit, aiming to re-engage inactive members. Under…