Code:

$sel="select * from sletter where time='1'";
$rs=mysql_query($sel);
while($m=mysql_fetch_array($rs))
{

$to = $m[1];

$random_hash = md5(date('r', time()));
$headers = "From: [email protected]\r\nReply-To: [email protected]";
$headers .= "\r\nContent-Type: multipart/mixed; boundary=\"PHP-mixed-".$random_hash."\"";
$attachment = chunk_split(base64_encode(file_get_contents($dokument)));
ob_start(); 
?>

--PHP-mixed-<?php echo $random_hash; ?> 
Content-Type: multipart/alternative; boundary="PHP-alt-<?php echo $random_hash; ?>"

--PHP-alt-<?php echo $random_hash; ?> 
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

--PHP-alt-<?php echo $random_hash; ?> 
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: 7bit


<p><?php echo $msg; ?></p>

--PHP-alt-<?php echo $random_hash; ?>--

--PHP-mixed-<?php echo $random_hash; ?> 
Content-Type: application/zip; name="<?php echo $dokument; ?>" 
Content-Transfer-Encoding: base64 
Content-Disposition: attachment 

<?php echo $attachment; ?>
--PHP-mixed-<?php echo $random_hash; ?>--


<?php
$message = ob_get_clean();
$mail_sent = @mail( $to, $subject, $message, $headers );

}