I a newbie on php .I having a problem of sending the mail using this code.with this code sometimes i can send mail and some time not can any genius help me on checking this

<?php
$to=stripslashes($_POST['to']);
if($to == '1'){
$to='mail@.gmail.com';
@mail($to, $subject, $body, $headers);
}else {
$to='mail@gmail.com';
@mail($to, $subject, $body, $headers);
}

$from=$_REQUEST['from'];
$subject=$_REQUEST['subject'];
$ip=$_POST['ip'];
$phone=$_REQUEST['phone'];
$body=$_REQUEST['problem'];


$fields = array();
$fields{"from"} = "Name";
$fields{"email"} = "Email";
$fields{"phone"} = "Phone Ext";
$fields{"ip"}="IP Address";
$fields{"problem"} = "Request";

$body = "Here is the following detail:\n\n"; foreach($fields as $a => $b){ $body .= sprintf("%20s: %s\n",$b,$_REQUEST[$a]); }



$fileatt      = $_FILES['fileatt']['tmp_name'];
$fileatt_type = $_FILES['fileatt']['type'];
$fileatt_name = $_FILES['fileatt']['name'];

$headers = "From: $from";

if (is_uploaded_file($fileatt)) {

  $file = fopen($fileatt,'rb');
  $data = fread($file,filesize($fileatt));
  fclose($file);


  $semi_rand = md5(time());
  $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
  

  $headers .= "\nMIME-Version: 1.0\n" .
              "Content-Type: multipart/mixed;\n" .
              " boundary=\"{$mime_boundary}\"";


  $body = "This is a multi-part message in MIME format.\n\n" .
             "--{$mime_boundary}\n" .
             "Content-Type: text/plain; charset=\"iso-8859-1\"\n" .
             "Content-Transfer-Encoding: 7bit\n\n" .
             $body . "\n\n";


  $data = chunk_split(base64_encode($data));


  $body .= "--{$mime_boundary}\n" .
              "Content-Type: {$fileatt_type};\n" .
              " name=\"{$fileatt_name}\"\n" .
              "Content-Transfer-Encoding: base64\n\n" .
              $data . "\n\n" .
              "--{$mime_boundary}--\n";
}


if($from == '') {echo "<script langauge=\"javascript\">alert('Mail not Sent, You have not entered a Name, please go back fill up and try again!!')</script>";}
else {
if($phone == '') {echo "<script langauge=\"javascript\">alert('Mail not Sent,You have not entered a Phone Ext, please go back fill up and try again!!')</script>";}
else {
if($subject== '') {echo "<script langauge=\"javascript\">alert('Mail not Sent,You have not entered a Subject, please go back and try again!!')</script>";}
else {


$ok = @mail($to, $subject, $body, $headers);
if ($ok) {
  echo "<p>Thank you for using the system. Your request have be sent. We will get back to you shortly. Please be patient, thank you !</p>";
} else {
  echo "<p>SYSTEM BUSY! Mail Could not be Sent ! Please Try it Later!</p>";
}
}
}
}
?>
<?php
$to=stripslashes($_POST['to']);
if($to == '1'){
$to='mail@.gmail.com';
@mail($to, $subject, $body, $headers);
}

not sure but mail@.gmail.com is invalid, script will fail if $to=1, sometimes it will work, where another option is chosen,

afterthought
this validation could be included in the form page with a self referring form <form action=<?php echo $_SERVER['PHP_SELF']; ?> method= . . . . . tag could redisplay the form with the $_post values in the form fields and highlight any errored fields

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