Why this code doesn’t send an email with drupal_email()?

I am developing a Drupal 6 module that should send an email after a form is submitted. So far, I wrote the following code.

function mailform_mail($key, &$message, $params) {
  $headers = array(
    'MIME-Version' => '1.0',
    'Content-Type' => 'text/html; charset=UTF-8; format=flowed',
    'Content-Transfer-Encoding' => '8Bit',
    'X-Mailer' => 'Drupal'
  );

  foreach ($headers as $key => $value) {
    $message['headers'][$key] = $value;
  }
  $message['subject'] = $params['subject'];
  $message['body'] = $params['body'];
}

/**
 * Form submission handler.
 */
function mailform_form_submit($form, &$form_state) {
  $valid_email = $form_state['values']['email'];
  $subject = $form_state['values']['Subject'];
  $body = $form_state['values']['body'];
  $params = array(
    'email'=> $valid_email,
    'body' => $body,
    'subject' => $subject,
  );

 // The first argument of drupal_mail() function must match the first part of the hook_mail function.
 // Therefore the first argument is  'mailform_form' and the the mail hook is 'mailform_form_mail'
 // For more infoormation see:
 // - http://api.drupal.org/api/function/drupal_mail/6
 // - http://api.drupal.org/api/function/hook_mail/6
 if (drupal_mail('mailform','reply', $valid_email, language_default(), $params, $from, TRUE) {
    drupal_set_message('An email has been sent to ' . $valid_email);
  }
  else {
    drupal_set_message('There was an error sending your email');
  }
}

Using this code, I can get the values after a form is submitted, but the mail is not sent out.

Is there anything wrong with the code? The module machine name is mailform.


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Author Of this post: Rahman
Title Of post: Why this code doesn’t send an email with drupal_email()?
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