diff --git a/lib/cybele/app_builder.rb b/lib/cybele/app_builder.rb
index c80b4c9..2a50d13 100644
--- a/lib/cybele/app_builder.rb
+++ b/lib/cybele/app_builder.rb
@@ -17,6 +17,11 @@ def remove_readme_rdoc
                   force: true
     end
 
+    def add_gems
+      # Add gems
+      append_file('Gemfile', template_content('cybele_Gemfile.erb'))
+    end
+
     def add_editor_config
       copy_file 'editorconfig', '.editorconfig'
     end
@@ -34,5 +39,22 @@ def use_postgres_config_template
     def create_database
       bundle_command 'exec rake db:create db:migrate'
     end
+
+    def configure_recipient_interceptor
+      config = <<-RUBY
+  Mail.register_interceptor RecipientInterceptor.new(Settings.email.sandbox, subject_prefix: '[STAGING]')
+      RUBY
+      configure_environment 'staging', config
+    end
+
+    def setup_staging_environment
+      run 'cp config/environments/production.rb config/environments/staging.rb'
+    end
+
+    private
+
+    def configure_environment(rails_env, config)
+      inject_into_file("config/environments/#{rails_env}.rb", "\n#{config}", before: "\nend")
+    end
   end
 end
diff --git a/lib/cybele/generators/app_generator.rb b/lib/cybele/generators/app_generator.rb
index 9ce6784..2f25144 100644
--- a/lib/cybele/generators/app_generator.rb
+++ b/lib/cybele/generators/app_generator.rb
@@ -57,6 +57,12 @@ def initialize(*args)
       @options.freeze
     end
 
+    def customize_gemfile
+      say 'Customize gem file', :green
+      build :add_gems
+      bundle_command 'install --binstubs=bin/stubs'
+    end
+
     def setup_editor_config
       say 'Add .editor_config file', :green
       build :add_editor_config
@@ -94,6 +100,16 @@ def setup_responders
       build :configure_responders
     end
 
+    def setup_staging_environment
+      say 'Setting up the staging environment'
+      build :setup_staging_environment
+    end
+
+    def configure_recipient_interceptor
+      say 'Setup mail settings with recipient_interceptor in staging', :green
+      build :configure_recipient_interceptor
+    end
+
     def goodbye
       say 'Congratulations! That\'s all...', :green
     end
diff --git a/templates/cybele_Gemfile.erb b/templates/cybele_Gemfile.erb
new file mode 100644
index 0000000..4034681
--- /dev/null
+++ b/templates/cybele_Gemfile.erb
@@ -0,0 +1,3 @@
+
+# For never accidentally send emails to real people from staging environment.
+gem 'recipient_interceptor', '~> 0.1.2'
\ No newline at end of file