gistfile1.rb

config/environments/development.rb

MyApp::Application.configure do
  # here are some existing settings
  # ...
  #

  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address              => "smtp.gmail.com",
    :port                 => 587,
    :domain               => 'some_domain',
    :user_name            => 'plain_username',
    :password             => 'plain_password',
    :authentication       => 'plain',
    :enable_starttls_auto => true
  }
end