Php 邮件密件抄送无法正常工作

我正在尝试编辑此脚本以将密件抄送副本发送给自己：

$to = $your_email;
$from = "Server Xt<[email protected]>";
$subject = "User Sent Msg :: $msg";
$HTMLmessage = $message;

emailHTML($to, $from, $subject, $HTMLmessage);

function emailHTML($to, $from, $subject, $HTMLmessage){

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

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

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

   $ok = @mail($to, $subject, $content, $headers);  

   if(!$ok) {    
   die("Error sending email");  
   }  
}

我尝试添加这个$headers .= "Bcc:[email protected]"\n";但它不会发送电子邮件...我该如何修改此脚本以使其正常工作？

分隔标题\r\n.

function emailHTML($to, $from, $subject, $HTMLmessage) {

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

   $headers = "From: ".$from . "\r\n";   
   $headers .= "Bcc: [email protected]\r\n";   
   $headers .=
   "MIME-Version: 1.0\r\n" .  
   "Content-Type: multipart/mixed;\r\n" .  
   " boundary=\"{$mime_boundary}\"";  

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

   $ok = @mail($to, $subject, $content, $headers);  

   if(!$ok) {    
   die("Error sending email");  
   }  
}