PHP联系表格帮助|未收到提交电子邮件

Question

我为我的网站创建了一个联系表以查询工作，但是我的测试表明，我有时只收到提交的信息。我不了解PHP，并且确定是问题所在。如果有人可以看看并找出问题所在，我将不胜感激，谢谢。标记

PHP代码在下面：//////////

<?php

$EmailTo = "Mark@markabove.com";
$Name = Trim(stripslashes($_POST['Name'])); 
$Email = Trim(stripslashes($_POST['Email']));
$Phone = Trim(stripslashes($_POST['Phone']));
$Subject = Trim(stripslashes($_POST['Subject'])); 
$Message = Trim(stripslashes($_POST['Message'])); 

// validation
$validationOK=true;
if (!$validationOK) {
  print "<meta http-equiv=\"refresh\" content=\"0;URL=error.htm\">";
  exit;
}

// prepare email body text
$Body = "";
$Body .= "Name: ";
$Body .= $Name;
$Body .= "\n";
$Body .= "Email: ";
$Body .= $Email;
$Body .= "\n";
$Body .= "Phone: ";
$Body .= $Phone;
$Body .= "\n";
$Body .= "Subject: ";
$Body .= $Subject;
$Body .= "\n";
$Body .= "Message: ";
$Body .= $Message;
$Body .= "\n";

// send email 
$success = mail($EmailTo, $Subject, $Body, "From: <$Email>");

// redirect to success page 
if ($success){
  print "<meta http-equiv=\"refresh\" content=\"0;URL=contactthanks.php\">";
}
else{
  print "<meta http-equiv=\"refresh\" content=\"0;URL=error.htm\">";
}
?>