PEAR, Mail Queue And Mail Mime

I have some trouble with my application.
It is written with PEAR, SMARTY ....
I should send an email to me and with Bcc to 50's else adresses.
But it send it just to me.
I am on an easyPhP server.
Here is my code

$mail_queue =& new Mail_Queue($db_options, $mail_options);

$from = 'my@email.org'
$from_name = "MY";
$replyTo = "my@email.org";
$message = stripslashes($msg);
$from_params = empty($from_name) ? '"'.$from_name.'" <'.$from.'>' :
'<'.$from.'>'
$hdrs = array( 'From' =$from_params,
'Reply-To'=$replyTo,
'To' =$from,
'Bcc' =$liste,
'Subject' =$sujet );

$mime =& new Mail_mime();
$mime->setTXTBody($msg);
$mime->addAttachment($pdf, $attach_type);
$body = $mime->get();
$hdrs = $mime->headers($hdrs);
$seconds_to_send = 1;
$delete_after_send = true;
$id_user = 7;
$mail_queue->put('','My Organisation',$from, 'my@email.org', $hdrs,
$body, $seconds_to_send, $delete_after_send, $id_user);

$liste follow this pattern "titi@tito.fr<titi@tito.fr>,
tita@tito.fr<tita@tito.fr>,titz@tito.fr<titz@tito.fr>,
tite@tito.fr<tite@tito.fr>,"

How can I do to send My emails to the Bcc's addresses too ?

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