c.f.
c.f. github.com/ryanb/cancan/blob/1.6.7/lib/cancan/controller_additions.rb#L348-L350
26 27 28
# File 'app/mailers/view_mailer.rb', line 26 def current_ability @current_ability ||= ::Ability.new(User.new) # Treat email recipients as Guests, not Customers end