Dunno, I'm subscribed to the git@ list and thus get copies of my own
messages.
vger.kernel.org (the list driver) however is selective (just like the
probe in the Star Trek movie) and easily unsubscribes people if anything
smells remotely fishy to their mail setup.
If you're still subscribed, is there a rampant duplicate mail suppressor
(for instance from antediluvian procmail installations) on your end? I
found those do more harm than good.
HTH
Matthias