Mail via form issue

We have a form that has stopped working after upgrading to php 4.3.8 Nothing else has changed.

the contents of the order.php that the form submits to is as follows:

Code:

<?
/*
<form method="POST" action="order.php">
<input type="hidden" name="to" value="name@domain.net">
<input type="hidden" name="from" value="Website Order">
<input type="hidden" name="subject" value="[WEBORDER] Gear Web Order">

*/
$vars = $HTTP_POST_VARS;

if ($vars) {
while (list ($key,$value) = each ($vars)) {
	if ($key == "to") { $toemail = $value; continue; }
	if ($key == "subject") { $subject = $value; continue; }
	if ($key == "from") { $from = $value; continue; }
	if ($key == "submit") { continue; }
	
	if ($value == "ON") { $value = "YES"; }
	
	 $message .= "$key:   $value\n";
}
mail($toemail, $subject, $message, "From: $from\nX-Mailer: PHP/" . phpversion());

echo "Thank you, your order has been sent.<br>".
     "<a href=\"javascript:history.back(1);\">Click here to return to our site.</a>";
}
?>

Has something changed that I need to fix? Is this a problem due to the upgrade? No mail is received at the address that is offsite. Any ideas? It has been working for approx a year without issues thru all the other upgrades. Thanks for your help

 

No, that didn't work either.... cpanel support said:
It looks like you'll need a more robust SMTP session sending solution instead of mail() for your script to be able to send mail.

Any ideas on what to use or how to accomplish this? It's funny, it's been working for over a year without changes, and now all of a sudden it isn't.

 

I tried that as well...no go.
We added a Fail message to it so we know if sendmail doesn't accept it and it fails each time to even send.
If I try to use formail clone, it gives a missing field, no recipient found, even though both 2 and from are showing on the results page. Again, no mail is sent.

 

Problem solved with a reinstall of exim. Everything working again.... will go over the backup file and try to find what was causing the error. Thanks for all your suggestions.