PHP from 缺少“from”，似乎

如何解决PHP from 缺少“from”，似乎

由于某种原因，此表单不久前停止工作。由于我不知道 PHP 是如何工作的，有人说我应该添加一个“来自”字段。不知道怎么做，所以如果有人可以在这里帮助我或指出一个已经存在的代码会产生相同的结果，太好了！ 这是代码：

<?PHP
$ip = $_SERVER['REMOTE_ADDR']; // get ip to short variable name for logging purposes 
$to = "[e-mail]";
$subject= "order home delivery via website";
$name = $_POST['name'];
$phone = $_POST['phone'];
$email = $_POST['email'];
$street = $_POST['street'];
$city = $_POST['city'];
$date = $_POST['date'];
$delivery = $_POST['delivery'];
$falafel = $_POST['falafel'];
$remarks = $_POST['remarks'];
$message = "
Name: $name
Phone: $phone
Email: $email
Address: $street,$city
Time of delivery: $date
Delivery: $delivery
Book: $book
Order: 
$falafel
Remarks: $remarks
";
  $mime_boundary="==Multipart_Boundary_x".md5(mt_rand())."x";
     $headers = "From: $email\r\n" .
     "MIME-Version: 1.0\r\n" .
        "Content-Type: multipart/mixed;\r\n" .
        " boundary=\"{$mime_boundary}\"";
     $message = "This is a multi-part message in MIME format.\n\n" .
        "--{$mime_boundary}\n" .
        "Content-Type: text/plain; charset=\"iso-8859-1\"\n" .
        "Content-transfer-encoding: 7bit\n\n" .
     $message . "\n\n";
     foreach($_FILES as $userfile)
     {
        $tmp_name = $userfile['tmp_name'];
        $type = $userfile['type'];
        $name = $userfile['name'];
        $size = $userfile['size'];
        if (file_exists($tmp_name))
        {
           if(is_uploaded_file($tmp_name))
           {
              $file = fopen($tmp_name,'rb');
              $data = fread($file,filesize($tmp_name));
              fclose($file);
              $data = chunk_split(base64_encode($data));
           }
           $message .= "--{$mime_boundary}\n" .
              "Content-Type: {$type};\n" .
              " name=\"{$name}\"\n" .
              "Content-disposition: attachment;\n" .
              " filename=\"{$fileatt_name}\"\n" .
              "Content-transfer-encoding: base64\n\n" .
           $data . "\n\n";
        }
     }
     $message.="--{$mime_boundary}--\n";
if (mail($to,$subject,$message,$headers))
echo "<b>Thanks for your order.</b><br>It will be processed very shortly,so I will get back to you soon.<br>Please stay healthy in the meantime.
<br>&nbsp;<br>&nbsp;<br><blockquote class='bordered layout-2'><b>This was your order:</b>
<br>&nbsp;<br>$name
<br>$street,$city
<br>$phone - $email
<br>&nbsp;<br>$book
<br>&nbsp;<br>$delivery
<br>delivery time: $date
<br>&nbsp;<br>$falafel
<br>&nbsp;<br>Remarks:<br>$remarks</blockquote>
<br>&nbsp;<br><a href='https://mywebsite.com/home-delivery.PHP' class='btn btn-outline-maincolor'>Missed something - go back</a>
";
else
echo "Your order has not been processed.<br>Please try again,filling in all fields.<br><a href='https://mywebsite.com/home-delivery.PHP'>&#187; go back</a>";
?>

谁能告诉我我应该添加什么才能让它再次工作？ 谢谢。