通过联系我们的表格将信息发送到我的电子邮件中

我有一个使用HTML文件和PHP文件（sendeamil.PHP）的联系我们表单，该文件由（header.HTML、footer.HTML和contentsendemail.PHP）组成，其中是我将信息发送到电子邮件的代码。

我有我的HTML文件和表单：

<form name="htmlform" method="post" action="sendemail.php">
<table width="450px">
</tr>
<tr>
 <td valign="top">
  <label for="first_name">First Name *</label>
 </td>
 <td valign="top">
  <input  type="text" name="first_name" maxlength="50" size="30">
 </td>
</tr>
<tr>
 <td valign="top"">
  <label for="last_name">Last Name *</label>
 </td>
 <td valign="top">
  <input  type="text" name="last_name" maxlength="50" size="30">
 </td>
</tr>
<tr>
 <td valign="top">
  <label for="email">Email Address *</label>
 </td>
 <td valign="top">
  <input  type="text" name="email" maxlength="80" size="30">
 </td>
</tr>
<tr>
 <td valign="top">
  <label for="telephone">Telephone Number</label>
 </td>
 <td valign="top">
  <input  type="text" name="telephone" maxlength="30" size="30">
 </td>
</tr>
<tr>
 <td valign="top">
  <label for="comments">Comments *</label>
 </td>
 <td valign="top">
  <textarea  name="comments" maxlength="1000" cols="25" rows="6">     </textarea>
 </td>
</tr>
<tr>
 <td colspan="2" style="text-align:center">
<input type="submit" value="Submit">   ( <a href="http://www.freecontactform.com/html_form.php">HTML Form</a> )
 </td>
</tr>
</table>
</form>

然后我有我的sendemail.php文件，它由页眉、内容和页脚组成：

<?php  
include("templates/header.html");  
$action = 'contentsendemail';
$disallowed_paths = array('header', 'footer');
if (!empty($_GET['action'])) {
$tmp_action = basename($_GET['action']);
if (!in_array($tmp_action, $disallowed_paths) && file_exists("templates/{$tmp_action}.php"))
    $action = $tmp_action;
}
include("templates/$action.php");
include("templates/footer.html"); 
?>

我的contentsendemail.php文件：

<?php
if(isset($_POST['email'])) {
// CHANGE THE TWO LINES BELOW
$email_to = "myemail@gmail.com";
$email_subject = "Subject Here";

function died($error) {
    // your error code can go here
    echo "We are very sorry, but there were error(s) found with the form you submitted. ";
    echo "These errors appear below.<br /><br />";
    echo $error."<br /><br />";
    echo "Please go back and fix these errors.<br /><br />";
    die();
}
// validation expected data exists
if(!isset($_POST['first_name']) ||
    !isset($_POST['last_name']) ||
    !isset($_POST['email']) ||
    !isset($_POST['telephone']) ||
    !isset($_POST['comments'])) {
    died('We are sorry, but there appears to be a problem with the form you submitted.');       
}
$first_name = $_POST['first_name']; // required
$last_name = $_POST['last_name']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['telephone']; // not required
$comments = $_POST['comments']; // required
 $error_message = "";
 $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+'.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
 $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
    $string_exp = "/^[A-Za-z .'-]+$/";
    if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
   if(!preg_match($string_exp,$last_name)) {
   $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
 }
  if(strlen($comments) < 2) {
  $error_message .= 'The Comments you entered do not appear to be valid.<br />';
 }
  if(strlen($error_message) > 0) {
  died($error_message);
  }
  $email_message = "Form details below.'n'n";
function clean_string($string) {
  $bad = array("content-type","bcc:","to:","cc:","href");
  return str_replace($bad,"",$string);
}
$email_message .= "First Name: ".clean_string($first_name)."'n";
$email_message .= "Last Name: ".clean_string($last_name)."'n";
$email_message .= "Email: ".clean_string($email_from)."'n";
$email_message .= "Telephone: ".clean_string($telephone)."'n";
$email_message .= "Comments: ".clean_string($comments)."'n";

$headers = 'From: '.$email_from."'r'n".
'Reply-To: '.$email_from."'r'n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);  
?>
Thank you for contacting us. 
<?php
}
die();
?>

我有两个问题：

1. 我没有收到任何电子邮件。我需要在服务器或其他地方做些什么来发送电子邮件吗？为什么我没有收到电子邮件？

2. 当我在contactus.php网站中单击提交时，我会收到消息"谢谢你联系我们"。在sendemail.php中，我会同时包含header.html和contentsendemailphp，但不包含footer.html。