Which of the solutions below should be used to replace computing related Hypernews?

Mattermost (secure, encrypted, colaborattive, allows identity verification, 2 FA ready, cross-link to posts, but not threadded)
17% (1 vote)
mailman mailing lists (known tool, PWG used, FWD-able, no easy cross-link to older messages, not secure so phishing/virus/... )
33% (2 votes)
Google groups (threaded, Web but can send a copy via Email, may be restricted to audience, 2FA+ ready, no BNL/IDP)
17% (1 vote)
discourse (2FA/SSO enabled, "like" Google groups i.e. forums, may be installed at BNL, Mattermost integration)
33% (2 votes)
no opinion
0% (0 votes)
Total votes: 6