-d should (maybe) be the default for `bin/mailman create`
bin/mailman create has a -d option which says to create the domain of the new mailing list's posting address if it doesn't already exist. At Pycon it was observed that it was kind of silly to always have to specify -d and that maybe it should be the default. The reason I didn't do that was because of typos, which would be a bit of work to undo.
Maybe once we have list renaming exposed, this would be useful. But I'm still not sure.