通过php发送电子邮件时的安全问题

Question

我创建了一个文件来测试使用Mail.php库通过php发送电子邮件，但是，当我一次需要“ Mail.php”时，服务器返回以下错误：ModSecurity：允许访问（阶段1）。 php文件只有这一行代码。我该如何解决？

我要编写的代码是这样：

 require_once "Mail.php";
 
 $from = "Sandra Sender <sender@example.com>";
 $to = "Ramona Recipient <recipient@example.com>";
 $subject = "Hi!";
 $body = "Hi,\n\nHow are you?";
 
 $host = "mail.gdom.net";
 $username = "lfc hosted email";
 $password = "email password";
 
 $headers = array ('From' => $from,
   'To' => $to,
   'Subject' => $subject);
 $smtp = Mail::factory('smtp',
   array ('host' => $host,
     'auth' => true,
     'username' => $username,
     'password' => $password));
 
 $mail = $smtp->send($to, $headers, $body);
 
 if (PEAR::isError($mail)) {
   echo("<p>" . $mail->getMessage() . "</p>");
 } else {
   echo("<p>Message successfully sent!</p>");
 }