Actually Nathan is suffering from Boolean breakage today :) That really
ought to evaluate false, but if you have Review= Owners (that is, the
plural form) then it would evaluate true. The default from default.mailtpl
for that .bb command is actually
.bb ((&x ^= POSTMASTER) and (&x ^= OWNER)) and (&x ^= OWNERS)
So you may want to fix that first and see what happens.
Nathan