diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index 75c9a3a..952c1ca 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -422,6 +422,7 @@ class Mailer < ActionMailer::Base
 
   def self.method_missing(method, *args, &block)
     if m = method.to_s.match(%r{^deliver_(.+)$})
+      ActiveSupport::Deprecation.warn "Mailer.deliver_#{m[1]}(*args) is deprecated. Use Mailer.#{m[1]}(*args).deliver instead."
       send(m[1], *args).deliver
     else
       super