config/initializers/email.rb

email.rb

unless Rails.env.development? || Rails.env.test?
  config.action_mailer.default_url_options = { :host => 'www.myappurl.com' }
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
      :enable_starttls_auto => true,
      :address => "smtp.gmail.com",
      :port => 587,
      :domain => "gmail.com",
      :authentication => :login,
      :user_name => "[email protected]",
      :password => "password"
  }
end