I don't think that auto-subscribe or forwarding from mail-archive would be feasible. At least, I don't see how this is supposed to work. May I ask why Gmane (and only it) shouldn't be allowed to subscribe? Which attack vectors do you see? I'm a Gmane admin (albeit lazy recently) so I could answer a few questions.
On the other hand, a dedicated Launchpad NNTP service sounds great, too.
I don't think that auto-subscribe or forwarding from mail-archive would be feasible. At least, I don't see how this is supposed to work. May I ask why Gmane (and only it) shouldn't be allowed to subscribe? Which attack vectors do you see? I'm a Gmane admin (albeit lazy recently) so I could answer a few questions.
On the other hand, a dedicated Launchpad NNTP service sounds great, too.