Drupal发送邮件问题

My problem begins when I had to add a single landing page to an existing Drupal website. I've never worked with this CMS, so I just created a folder for this page in the root folder and put all the content there.

Then it appeared that I need to send mail from this page after submitting a form there. As I understood I can't use drupal_mail() function there, so I tried something like that:

$to      = $email;
$subject = 'the subject';
$message = 'hello';
$headers = 'From: ' . $email . "
" .
    'Reply-To: ' . $email . "
" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);

But that gave me no result.

Then I installed SMTP auth module for Drupal and tried to send mail, but again I had no result. However, test messages from SMTP module have been sent correctly.

    <?php
    $to      = $email;
    $subject = 'the subject';
    $message = 'hello';

    $headers = "MIME-Version: 1.0" . "
";
    $headers .= "Content-type: text/html; charset=utf-8" . "
";
    $headers .= "From: $email" . "
";
    $headers .= "Reply-To:: $email" . "
";

    mail($to, $subject, $message, $headers);
    ?>

Some hosts require you to use an additional parameter, -f, to send mail.

Try:

mail($to, $subject, $message, $headers, "-f".$email);