访问被拒绝.PHP脚本

我有一个联系人表格，当在我的页面上提交时，上面写着"拒绝访问"没有其他东西，所以我似乎不知道如何调试。

这是代码：

<?php
    $EmailFrom = "username@email.com";
    $EmailTo = "username@email.com, username2@email.com";
    $Subject = "Subject";
    $Name = Trim(stripslashes($_POST['Name'])); 
    $Company = Trim(stripslashes($_POST['Company'])); 
    $Email = Trim(stripslashes($_POST['Email'])); 
    $Tel = Trim(stripslashes($_POST['Tel']));
    $Message = Trim(stripslashes($_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 .= "Company: ";
    $Body .= $Company;
    $Body .= "'n";
    $Body .= "Tel: ";
    $Body .= $Tel;
    $Body .= "'n";
    $Body .= "Further comments: ";
    $Body .= $Message;
    $Body .= "'n";
    // Send Email 
    $success = mail($EmailTo, $Subject, $Body, "From: <$Email>");
    // Redirect To Success Page 
    if ($success)
    {
        echo '<script>alert("Thanks for your message, somebody will get in touch with your shortly.");</script>';
        echo "<meta http-equiv='"refresh'" content='"0;URL=../contact'">";
    }
    else
    {
        echo '<script>alert("There has been an error, please try again later.");</script>';
        echo '<script>history.back(1);</script>';
        exit;
    }
?>

我不知道为什么它不起作用，有人能解释一下吗？