문의하기 게시판인데 제가 테스트 했을 때는 메일이 갔다고 하는데

다른 분이 게시글 남기니까 안왔다고 하더라구요

지메일이 이런 오류가 많은 것 같던데 도와주세요 ㅠㅠ

// board/lib/mailer.lib.php

<?php
if (!defined('_GNUBOARD_')) exit;

include_once(G5_PHPMAILER_PATH.'/PHPMailerAutoload.php');

// 메일 보내기 (파일 여러개 첨부 가능)
// type : text=0, html=1, text+html=2
function mailer($fname, $fmail, $to, $subject, $content, $type=0, $file="", $cc="", $bcc="")
{
    global $config;
    global $g5;

    // 메일발송 사용을 하지 않는다면
    if (!$config['cf_email_use']) return;

    if ($type != 1)
        $content = nl2br($content);

    $result = run_replace('mailer', $fname, $fmail, $to, $subject, $content, $type, $file, $cc, $bcc);
    
    if( is_array($result) && isset($result['return']) ){
        return $result['return'];
    }

    $mail_send_result = false;

    try {
        $mail = new PHPMailer(); // defaults to using php "mail()"
        if (defined('G5_SMTP') && G5_SMTP) {
            $mail->IsSMTP(); // telling the class to use SMTP
            $mail->Host = G5_SMTP; // SMTP server
            if(defined('G5_SMTP_PORT') && G5_SMTP_PORT)
                $mail->Port = G5_SMTP_PORT;
        }
        $mail->CharSet = 'UTF-8';
        $mail->From = $fmail;
        $mail->FromName = $fname;
        $mail->Subject = $subject;
        $mail->AltBody = ""; // optional, comment out and test
        $mail->msgHTML($content);
        $mail->addAddress($to);
        if ($cc)
            $mail->addCC($cc);
        if ($bcc)
            $mail->addBCC($bcc);
        //print_r2($file); exit;
        if ($file != "") {
            foreach ($file as $f) {
                $mail->addAttachment($f['path'], $f['name']);
            }
        }

        $mail = run_replace('mail_options', $mail, $fname, $fmail, $to, $subject, $content, $type, $file, $cc, $bcc);

        $mail_send_result = $mail->send();

    } catch (Exception $e) {
    }

    run_event('mail_send_result', $mail_send_result, $mail, $to, $cc, $bcc);

    return $mail_send_result;
}

// 파일을 첨부함
function attach_file($filename, $tmp_name)
{
    // 서버에 업로드 되는 파일은 확장자를 주지 않는다. (보안 취약점)
    $dest_file = G5_DATA_PATH.'/tmp/'.str_replace('/', '_', $tmp_name);
    move_uploaded_file($tmp_name, $dest_file);
    $tmpfile = array("name" => $filename, "path" => $dest_file);
    return $tmpfile;
}

-----------------------------------------------------------------------------------------------------


// board/plugin/PHPMailer/clss.smtp.php

 public function connect($host, $port = null, $timeout = 30, $options = array())
    {
        if(count($options)==0){
            $options['ssl']=array('verify_peer'=>false,'verify_peer_name'=>false,'allow_self_signed'=>true);
        }
        
        static $streamok;
        //This is enabled by default since 5.0.0 but some providers disable it
        //Check this once and cache the result
        if (is_null($streamok)) {
            $streamok = function_exists('stream_socket_client');
        }
        // Clear errors to avoid confusion
        $this->setError('');
        // Make sure we are __not__ connected
        if ($this->connected()) {
            // Already connected, generate error
            $this->setError('Already connected to a server');
            return false;
        }
        if (empty($port)) {
            $port = self::DEFAULT_SMTP_PORT;
        }
        // Connect to the SMTP server
        $this->edebug(
            "Connection: opening to $host:$port, timeout=$timeout, options=" .
            var_export($options, true),
            self::DEBUG_CONNECTION
        );
        $errno = 0;
        $errstr = '';
        if ($streamok) {
            $socket_context = stream_context_create($options);
            set_error_handler(array($this, 'errorHandler'));
            $this->smtp_conn = stream_socket_client(
                $host . ":" . $port,
                $errno,
                $errstr,
                $timeout,
                STREAM_CLIENT_CONNECT,
                $socket_context
            );
            restore_error_handler();
        } else {
            //Fall back to fsockopen which should work in more places, but is missing some features
            $this->edebug(
                "Connection: stream_socket_client not available, falling back to fsockopen",
                self::DEBUG_CONNECTION
            );
            set_error_handler(array($this, 'errorHandler'));
            $this->smtp_conn = fsockopen(
                $host,
                $port,
                $errno,
                $errstr,
                $timeout
            );
            restore_error_handler();
        }
        // Verify we connected properly
        if (!is_resource($this->smtp_conn)) {
            $this->setError(
                'Failed to connect to server',
                $errno,
                $errstr
            );
            $this->edebug(
                'SMTP ERROR: ' . $this->error['error']
                . ": $errstr ($errno)",
                self::DEBUG_CLIENT
            );
            return false;
        }
        $this->edebug('Connection: opened', self::DEBUG_CONNECTION);
        // SMTP server can take longer to respond, give longer timeout for first read
        // Windows does not have support for this timeout function
        if (substr(PHP_OS, 0, 3) != 'WIN') {
            $max = ini_get('max_execution_time');
            // Don't bother if unlimited
            if ($max != 0 && $timeout > $max) {
                @set_time_limit($timeout);
            }
            stream_set_timeout($this->smtp_conn, $timeout, 0);
        }
        // Get any announcement
        $announce = $this->get_lines();
        $this->edebug('SERVER -> CLIENT: ' . $announce, self::DEBUG_SERVER);
        return true;
    }