我在此代码中遇到问题但没有显示任何错误，但它没有发送邮件 现实我的服务器是更新，现在正在工作，在更新服务器之前它工作正常，我不知道它的原因请帮帮我 谢谢
$config['useragent'] = 'PHPMailer';
$config['protocol'] = 'mail';
$config['mailpath'] = '/usr/sbin/sendmail';
$config['smtp_host'] = 'localhost';
$config['smtp_user'] = 'email@mail.com';
$config['smtp_pass'] = '********';
$config['smtp_port'] = 25;
$config['smtp_timeout'] = 30; // (in seconds)
$config['smtp_crypto'] = 'ssl'; // '' or 'tls' or 'ssl'
$config['smtp_debug'] = 0; // PHPMailer's SMTP debug info level: 0 = off, 1 = commands, 2 = commands and data, 3 = as 2 plus connection status, 4 = low level data output.
$config['debug_output'] = ''; // PHPMailer's SMTP debug output: 'html', 'echo', 'error_log' or user defined function with parameter $str and $level. NULL or '' means 'echo' on CLI, 'html' otherwise.
$config['smtp_auto_tls'] = true; // Whether to enable TLS encryption automatically if a server supports it, even if `smtp_crypto` is not set to 'tls'.
$config['smtp_conn_options'] = array(); // SMTP connection options, an array passed to the function stream_context_create() when connecting via SMTP.
$config['wordwrap'] = true;
$config['wrapchars'] = 76;
$config['mailtype'] = 'html'; // 'text' or 'html'
$config['charset'] = null; // 'UTF-8', 'ISO-8859-15', ...; NULL (preferable) means config_item('charset'), i.e. the character set of the site.
$config['validate'] = true;
$config['priority'] = 3; // 1, 2, 3, 4, 5; on PHPMailer useragent NULL is a possible option, it means that X-priority header is not set at all, see https://github.com/PHPMailer/PHPMailer/issues/449
$config['crlf'] = "\n"; // "\r\n" or "\n" or "\r"
$config['newline'] = "\n"; // "\r\n" or "\n" or "\r"
$config['bcc_batch_mode'] = false;
$config['bcc_batch_size'] = 200;
$config['encoding'] = '8bit';
$config['dkim_domain'] = ''; // DKIM signing domain name, for exmple 'example.com'.
$config['dkim_private'] = ''; // DKIM private key, set as a file path.
$config['dkim_private_string'] = ''; // DKIM private key, set directly from a string.
$config['dkim_selector'] = ''; // DKIM selector.
$config['dkim_passphrase'] = ''; // DKIM passphrase, used if your key is encrypted.
$config['dkim_identity'] = ''; // DKIM
这是我在控制器中的邮件功能
$this->load->library('email');
$subject = 'This is a test';
$message = '<p> testing message.</p>';
$body = '<html>
<head></head>
<body>' . $message . ' </body> </html>';
$result = $this->email
->from('email@mail.com')
->reply_to('email@mail.com')
->to('senfmail@mail.com')
->subject($subject)
->message($body)
->send();
var_dump($result);
echo '<br />';
echo $this->email->print_debugger();
exit;