Index: Gemfile
===================================================================
--- Gemfile	(revision 14471)
+++ Gemfile	(working copy)
@@ -14,6 +14,7 @@
 gem "actionpack-action_caching"
 gem "actionpack-xml_parser"
 gem "loofah", "~> 2.0"
+gem "roadie-rails"
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :x64_mingw, :mswin, :jruby]
Index: app/models/mailer.rb
===================================================================
--- app/models/mailer.rb	(revision 14471)
+++ app/models/mailer.rb	(working copy)
@@ -15,6 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
+require 'roadie'
+
 class Mailer < ActionMailer::Base
   layout 'mailer'
   helper :application
@@ -22,6 +24,7 @@
   helper :custom_fields
 
   include Redmine::I18n
+  include Roadie::Rails::Automatic
 
   def self.default_url_options
     options = {:protocol => Setting.protocol}