code: def subject
  
        unless @subject
          subject = mail.subject.strip rescue ""
          ignores = config['ignore']['text/plain']
          if ignores && ignores.detect{|s| s == subject}
            @subject = ""
          else
            @subject = transform_text('text/plain', subject).last
          end
        end
  
        @subject
      end
docs: Return the Subject for this message, returns "" for default carrier
   subject such as 'Multimedia message' for ATT&T carrier.