Document URL:
https://access.redhat.com/documentation/en/red-hat-satellite/6.2/paged/installation-guide/chapter-3-installing-satellite-server#performing_initial_configuration_sat_server_parent

Section Number and Name: 
Section: 3.4.5. Configuring Satellite Server for Outgoing Emails

1. Edit the configuration file /etc/foreman/email.yaml to match your preferred delivery method. 
production:
   email_delivery: <=== problem with this line
      delivery_method: :smtp

Describe the issue: 
The line email_delivery:  throws below error messages:
Which is unsupported. See error below

Web application could not be started

undefined method `email_delivery=' for ActionMailer::Base:Class (NoMethodError)
  /opt/rh/rh-ror41/root/usr/share/gems/gems/actionmailer-4.1.5/lib/action_mailer/base.rb:553:in `method_missing'
  /usr/share/foreman/config/initializers/email.rb:14:in `block in <top (required)>'
  /usr/share/foreman/config/initializers/email.rb:12:in `each'
  /usr/share/foreman/config/initializers/email.rb:12:in `<top (required)>'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:241:in `load'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:241:in `block in load'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:232:in `load_dependency'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:241:in `load'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/engine.rb:648:in `block in load_config_initializer'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/activesupport-4.1.5/lib/active_support/notifications.rb:161:in `instrument'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/engine.rb:647:in `load_config_initializer'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/engine.rb:611:in `each'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/engine.rb:611:in `block in <class:Engine>'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:30:in `instance_exec'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:30:in `run'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:55:in `block in run_initializers'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:226:in `block in tsort_each'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:420:in `block (2 levels) in each_strongly_connected_component_from'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:429:in `each_strongly_connected_component_from'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:419:in `block in each_strongly_connected_component_from'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:44:in `each'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:44:in `tsort_each_child'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:413:in `call'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:413:in `each_strongly_connected_component_from'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:347:in `block in each_strongly_connected_component'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:345:in `each'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:345:in `call'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:345:in `each_strongly_connected_component'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:224:in `tsort_each'
  /opt/rh/rh-ruby22/root/usr/share/ruby/tsort.rb:203:in `tsort_each'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/initializable.rb:54:in `run_initializers'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/application.rb:300:in `initialize!'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/railtie.rb:194:in `public_send'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/railties-4.1.5/lib/rails/railtie.rb:194:in `method_missing'
  /usr/share/foreman/config/environment.rb:5:in `<top (required)>'
  /opt/rh/rh-ruby22/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:54:in `require'
  /opt/rh/rh-ruby22/root/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:54:in `require'
  config.ru:3:in `block in <main>'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
  /opt/rh/rh-ror41/root/usr/share/gems/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
  config.ru:1:in `new'
  config.ru:1:in `<main>'
  /usr/share/gems/gems/passenger-4.0.18/helper-scripts/rack-preloader.rb:105:in `eval'
  /usr/share/gems/gems/passenger-4.0.18/helper-scripts/rack-preloader.rb:105:in `preload_app'
  /usr/share/gems/gems/passenger-4.0.18/helper-scripts/rack-preloader.rb:150:in `<module:App>'
  /usr/share/gems/gems/passenger-4.0.18/helper-scripts/rack-preloader.rb:29:in `<module:PhusionPassenger>'
  /usr/share/gems/gems/passenger-4.0.18/helper-scripts/rack-preloader.rb:28:in `<main>'
Application root
/usr/share/foreman
Environment (value of RAILS_ENV, RACK_ENV, WSGI_ENV and PASSENGER_ENV)
production


Suggestions for improvement: 
/etc/foreman/email.yaml
production:
   email_delivery: <========== Needs to be removed
      delivery_method: :smtp
      smtp_settings:
         address: smtp.example.com
         port: 25
         domain: example.com
         authentication: :login
         user_name: satellite
         password: satellite

Additional information: After remove the line "email_delivery:", it works perfectly fine.