pokemon.trade/config/initializers/letter_opener.rb

LetterOpener.configure do |config|
  # To overrider the location for message storage.
  # Default value is <tt>tmp/letter_opener</tt>
  #config.location = Rails.root.join('tmp', 'letter_opener')

  # To render only the message body, without any metadata or extra containers or styling.
  # Default value is <tt>:default</tt> that renders styled message with showing useful metadata.
  #config.message_template = :default

  #If you want to change application that will be used to open your emails you
  #should override LAUNCHY_APPLICATION environment variable or set
  #Launchy.application.
end