src/NotifierEmailSwiftMailerService.php
public function sendMessageById($sendSettings, $messageId){
        $messageId = (int) $messageId;
        
        if (!(isset($this->messages[$messageId]))) {
            throw new NotifierEmailException('Trying to send Message by Id, for an Id that is not set');
        }

        $this->_bootstrapMailHandler();        
        $this->_bootstrapMailMessage($messageId);
        
        //phpmailer exception used
        try {
            $this->mailHandler->Send();            
        } catch (phpmailerException $ex) {
            echo $ex->errorMessage();
        }        
    }
public function sendMessageById($sendSettings, $messageId){
        $messageId = (int) $messageId;
        
        if (!(isset($this->messages[$messageId]))) {
            throw new NotifierEmailException('Trying to send Message by Id, for an Id that is not set');
        }

        $this->_bootstrapMailHandler();        
        $this->_bootstrapMailMessage($messageId);
        
        //phpmailer exception used
        try {
            $this->mailHandler->Send();            
        } catch (phpmailerException $ex) {
            echo $ex->errorMessage();
        }        
    }
function sendMessageById() - Set message using its id

@param   array $sendSettings - Additional send settings
@param   int   $messageId    - The message Id

@return  boolean