collect_responses

# File actionmailer/lib/action_mailer/base.rb, line 843
    def collect_responses(headers) #:nodoc:
      responses = []

      if block_given?
        collector = ActionMailer::Collector.new(lookup_context) { render(action_name) }
        yield(collector)
        responses = collector.responses
      elsif headers[:body]
        responses << {
          body: headers.delete(:body),
          content_type: self.class.default[:content_type] || "text/plain"
        }
      else
        templates_path = headers.delete(:template_path) || self.class.mailer_name
        templates_name = headers.delete(:template_name) || action_name

        each_template(Array(templates_path), templates_name) do |template|
          self.formats = template.formats

          responses << {
            body: render(template: template),
            content_type: template.type.to_s
          }
        end
      end

      responses
    end