Currently when a build fails, Hudson just sends mail (if so configured) to those
who committed changes to the build. In fact it ought to send mail to everyone
who committed to any immediately preceding failed builds, i.e. accumulate
recipients until the breakage is fixed. This is because the usual case is that a
commit in the first broken build has not been fixed several builds later;
occasionally someone else introduces an unrelated problem. Continuing to notify
the original culprit keeps pressure on them, and helps other committers to see
that they are not necessarily at fault.