Help with newsletter PHP Mail script for mySQL / cron job

Question

I'm just trying to set up a PHP script to send emails as a cron job.
It pretty much seems to work, but I can't get it to do two parts.
The first part is to send the emails, and the second is to send a notification email to the site owner confirming that the emails have been sent.
The script looks like:
<?php
include_once "connect_to_mysql.php";
$sql = mysql_query("SELECT UserID, Firstname, Email, Newsletter_Received FROM Users WHERE Firstname='test' LIMIT 20");
$numRows = mysql_num_rows($sql);
$mail_body = '';
while($row = mysql_fetch_array($sql)){
  $id = $row["UserID"];
  $email = $row["Email"];
  $name = $row["Firstname"];
  $mail_body = 'Test - please ignore';
    $subject = "Safari Awards Newsletter";
    $headers  = "From:[email protected]\r\n";
    $headers .= "Content-type: text/html\r\n";
    $to = "$email";
    $mail_result = mail($to, $subject, $mail_body, $headers);
  if ($mail_result) {
  mysql_query("UPDATE Users SET Newsletter_Received='1' WHERE Email='$email' LIMIT 20");
  } else {
?>
<?php
if ($numRows == 0) {
  $subj = "Newsletter Sent";
  $body = "The current newsletter has been sent to everyone.";
     $hdr  = "From:[email protected]\r\n";
     $hdr .= "Content-type: text/html\r\n";
     mail("[email protected]", $subj, $body, $hdr);
?>
Basically with the line
include_once "connect_to_mysql.php";
included, it sends the emails as per the SELECT query, but does not send the 'Newsletter Sent' email.
But if I take out that line, it obviously doesn't send the emails as per the SELECT query, but it does send the 'Newsletter Sent' email.
Any suggestions on what might need changing in order for it to do both would be much appreciated!
Thanks.

Answer 1

Change this line -
if ($numRows == 0) {
to this -
if ($mail_result) {