Much of the free software we run every day was developed over email, and
the developers of that software, who may have been using email for decades,
tend to be somewhat attached to it. The newer generation of developers
that came later, though, has proved remarkably resistant to the charms of
email-based communication. That has led to an ongoing push to replace
email with other forms of communication; often the “other form” of choice
is a web-based system called Discourse. Moving to Discourse tends
to be controversial; LWN covered related
discussions in the Fedora and Python projects in 2018. Now it is
Debian’s turn to confront this question.

Source: LWN.net – [$] Debian discusses Discourse