Description:
------------
Regular
use of mail() function, 4 parameters...Mail function sends mail, but it returns false or 'nothing'. I didn't find any error in any logs (php, apache,sendmail). Server: Solaris 5.8, php 5.0.2 (or 4.3.4 - it doesn't make difference!), apache 2.0 (xampp).

sendmail_path /usr/lib/sendmail -t -i /usr/lib/sendmail -t -i
PATH /usr/local/bin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin I am not supposed to change the above PATH, but I've made even something like ln -sf /usr/lib/sendmail /usr/bin/sendmail

Reproduce code:
---------------
<?php
$r = false; 
$fdate = date("d-m-Y"); $subject = "New request - $HTTP_HOST "; 
$msg_body = "\nDate: 15 nov 2004 \n"; 
$headers = "From: my_mail@domain.com\n"; 
$headers .= "X-Priority: 1\n"; 
$r = @mail("other_address@domain.com", $subject, $msg_body, $headers);
if($r) 
 { 
  echo "Mail sent"; 
 } 
else 
{
?> <div align="center" class="main"><p><?php echo
isset($r)."/".empty($r)."/Error"; ?> !!!</b></div>M
<?php 
}
?>

Expected result:
----------------
 "Mail sent" when the mail was successfully accepted for delivery;
 "1/1/Error !!!"
if the mail wasn't sent.

Actual result:
--------------
Sometimes returns "Mail sent", and most of the times returns "1/1/Error
!!!", but in both cases the mail has been sent. I couldn't determine when is made the diference. I don't find anything in logs.

I wanted to report this on 4.3.4 version, but I saw that I was not allowed and I upgraded to 5.0.2, as recommended. 5.0.2 made a mess through my software, one of the problems being  the well-konwn "PHP Fatal error:  Cannot re-assign $this in..". I'll get back to 4.3.4, but please let me know what should I do in order to use the mail() function properly..