The git-users mailing list is on Google Groups with obfuscated
addresses and censored archives. We should allow users to
import them soon, as obfuscated/censored archives are better
than not having archives at all when Google decides to shut down
yet-another-service.
There's also some mangling that (most) instances of Mailman do
(e.g. cgit), but being able to follow such groups over NNTP
and use our search functionality is still useful and better
than what typical Mailman installations provide.