On Sat, Nov 26, 2011 at 1:11 AM, Ariel T. Glenn <ariel(a)wikimedia.org> wrote:
I'm sure it can. If we had to we could give it to
all existing users,
it's just a bit more tedious.
Only to users that existed before you sent this mail. The vandal may
register a bunch of users after reading your mail and look forward to
the batch change right on them.
-Liangent