instance method create_parts_from_responses

# File actionmailer/lib/action_mailer/base.rb, line 1028
      def create_parts_from_responses(m, responses)
        if responses.size == 1 && !m.has_attachments?
          responses[0].each { |k, v| m[k] = v }
        elsif responses.size > 1 && m.has_attachments?
          container = Mail::Part.new
          container.content_type = "multipart/alternative"
          responses.each { |r| insert_part(container, r, m.charset) }
          m.add_part(container)
        else
          responses.each { |r| insert_part(m, r, m.charset) }
        end
      end