Linus Torvalds [off-list ref] writes:
(And yes, it does say that git should probably have errored out way more
aggressively about badly set up host/domain names in the "guess at email
address" code. My bad. Maybe it's still worth fixing for the future)
We made a small step in that direction in 49ff9a7 (commit: show
interesting ident information in summary, 2010-01-13). I think what it
does is sufficiently loud (but not annoying).