Bounced Email Headers

[Anon]

I need to be alerted when an email sent using PHP Send is bounced back.

I've seen the odd reference to:
Errors-To and X-Errors-To

I haven't seen either of these documented anywhere, but I've tried using them as shown in the script below. However, it doesn't bounce back.

The problem could be in my script and/or with the hosting company. Any suggestions (including where to find documentation on Send headers) would be very much appreciated.

Thanks
Mark

Here's my test script:
<?php
echo "Testing bounce-back destination!";
$message = "Where have I gone?";
$to = "[e-mail]"; //invalid I hope

$sender = "[e-mail]";
$replyto = "[e-mail]";
$errorsto = "[e-mail]";
$xerrorsto = "[e-mail]";
$sendr = "[e-mail]";
$subject = "Bounce-back Destination";
mail($to, $subject, $message, "From: $sender\nReply-To: $replyto\nErrors-To: $errorsto\nX-Errors-To: $xerrorsto\nSender: $sendr");
?>

[Anon]

Hi,

We are having the same problem. We guess that the SMTP servers we are talking to are deciding we are a bit risky and drop the emails rather than bounce them in case we are "spamming"(because the From: address doesnt have any provable association with the server and username that the PHP process is running as when it talks to sendmail).

Are we on the right track? Anyone got around this?

[Anon]

Being an ISP and writing a mailshot script do do the same sort of thing, we're haivng the same problem.
The bounced mails come back as being from "nobody" as that's the user the webserver (and so php) is running as. Then all the bounced mails end up in the root mailbox.
Also, somewhere along the line, the Reply-To: header is being stipped out (probably by the mailserver). So the trick is going to be either:
1) reconfigure sendmail/apache/php - the 'easiest' way would be to use the binary install of php and run the script under your username, hence the bounced mail would end up in your mailbox.
Or,
2) find some php way of stopping the mailserver stripping out the extra headers you want it to process...