SlightPHP\PHPMailer::SetMessageType PHP Method

    public function SetMessageType()
    {
        if (count($this->attachment) < 1 && strlen($this->AltBody) < 1) {
            $this->message_type = 'plain';
        } else {
            if (count($this->attachment) > 0) {
                $this->message_type = 'attachments';
            }
            if (strlen($this->AltBody) > 0 && count($this->attachment) < 1) {
                $this->message_type = 'alt';
            }
            if (strlen($this->AltBody) > 0 && count($this->attachment) > 0) {
                $this->message_type = 'alt_attachments';
            }
        }
    }