为什么我发送的电子邮件会转到其垃圾文件夹？

Question

我无法使用php发送电子邮件。这是我的代码。

<?php
// error_reporting(E_ALL ^ E_NOTICE ^ E_DEPRECATED ^ E_STRICT);

require_once "Mail.php";

$host = "ssl://mail12.heteml.jp";
$username = "username@mail.com";
$password = "mypassword";
$port = "465";
$to = "myname@hotmail.com";
$email_from = "from@mail";
$email_subject = "Subject Line Here:" ;
$email_body = "whatever you like" ;
$email_address = "email-address";

$headers = array ('From' => $email_from, 'To' => $to, 'Subject' => $email_subject, 'Reply-To' => $email_address);
$smtp = Mail::factory('smtp', array ('host' => $host, 'port' => $port, 'auth' => true, 'username' => $username, 'password' => $password));
$mail = $smtp->send($to, $headers, $email_body);


if (PEAR::isError($mail)) {
echo("<p>" . $mail->getMessage() . "</p>");
} else {
echo "<p>Message successfully sent!</p>";}
 ?>

这是我的代码。有用 。但是所有邮件都在其垃圾文件夹中发送。我不能解决这个问题。如果您知道，请帮助我。谢谢。