The Gentoo free software project has a number of public mailing lists, covering a variety of Gentoo-related subjects.
This page lists the most important lists with the most traffic. There are other, more specialized lists that might be more appropriate depending on the topic.
This is our main support and general talk mailing list.
General Gentoo developer discussion mailing list
General Gentoo announcements list (new releases, security fixes)
All of our public mailing lists are archived in the Gentoo Archives: