Using a rails helper in a mailer or other class

some_mailer.rb

class SomeMailer
  class Helper
    include ActionView::Helpers # rails standard helpers
    include HelpfulMethodsHelper # for some function i_wrote
  end
  
  def helper  
    @@h ||= Helper.new
  end
  
  def email_with_stuff
    # then you can use it like
    helper.strip_tags()
    #or
    helper.function_i_wrote
  end

end