QGIS has a set of mailing lists.

QGIS users list

The main list for user questions:

QGIS UX (User Experience) list

A dedicated mailing list where people can chime in and collect and discuss QGIS related UX (User Experience) / usability issues.

QGIS developers list

The main list for questions about the development of QGIS core or plugins

QGIS community team

List for managing the community: websites, documentation etc

QGIS translation

List for translators of either the website, or the QGIS itself

QGIS project steering community list