We currently use mailman 2.
Hyperkitty depends on mailman 3.
19:53 < qyliss> fwiw, I read that the mailman developer would like there to be a simpler UI than hyperkitty
19:53 < qyliss> and it's all modular so it should be easy enough to make one
19:53 < qyliss> but nobody has done so yet
19:52 < qyliss> You can keep the old interface around as a static html archive
19:52 < qyliss> But you can't put new mail into it after upgrading to mailman 3