Mat Kovach did a lot of work on notifications so it's
probably worth bringing it up to date, but if you have a
4.6.3 site I don't know if there are any dependencies
that would not be met (I think not but am not really sure).
There are not too many places where notif-.... email
addresses are glued together and I would just add
ns_log notice "NOTIF: ..."
statements there to debug it.
