anchor.diff:      }
   
       _currentAction = _actionAuthenticateComplete;
  -    sendCommand(base64.encode(options.password.codeUnits));
  +    sendCommand(convert.base64.encode(options.password.codeUnits));
     }
   
     void _actionAuthenticateComplete(String message) {
  
positive.code:       envelope._isDelivered = true;
  
        onIdle.listen((_) {
          _currentAction = _actionMail;
          sendCommand('MAIL FROM:<${Address.sanitize(_envelope.from)}>');
        });
  
negative.code:   }
  
    var _recipientIndex = 0;
    List<String> _allRecipients = [];
  
    void _actionMail(String message) {
      if (message.startsWith('2') == false)
  