Make non-preview methods in mailer preview private
Make non-preview methods in mailer preview private

When they are public methods, they show up at /rails/mailers.

WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard