"Subscribe" mails leaking through? - Mailing list pgsql-www

How did either of these get through?  Did somebody turn off the filter
for them?  Even with that, surely *all* mail to -announce ought to be
moderated?

http://archives.postgresql.org/pgsql-announce/2010-08/msg00009.php
http://archives.postgresql.org/pgsql-general/2010-08/msg00682.php
        regards, tom lane