Q:

Sending multiple email with codeigniter

I'm using Codeigniter 2 for my website.  When send email to multiple users , on  client( gmail, hotmail,..) it shows all addresse on details , how can i hide the addresses to show just the receiver address. 
Thanks

A:

Use bcc to send batch emails like this:
function batch_email($recipients, $subject, $message) 
{
  $this->email->clear(TRUE);
  $this->email->from('you@yoursite.com', 'Display Name'); 
  $this->email->to('youremailaddress@yourserver.com');
  $this->email->bcc($recipients);
  $this->email->subject($subject);
  $this->email->message($message);  

  $this->email->send();

    return TRUE;

}

$recipients should be a comma-delimited list or an array
It means that you will get a copy of the email but all other recipients will be bcc'ed, so won't see each other's addresses

A:

I think you are assigning all recipients in a single to method, like
$this->email->to('one@example.com, two@example.com, three@example.com');

This will mail to all recipients at once.  To prevent showing all recipients, mail it separately for each user, as follows,
foreach ($list as $name => $address)
{
    $this->email->clear();
    $this->email->to($address);
    $this->email->from('your@example.com');
    $this->email->subject('Here is your info '.$name);
    $this->email->message('Hi '.$name.'  Here is the info you requested.'); 
    $this->email->send();
}

Here $list contains array of Recipient name and email ID.  Make sure to use clear() at the beginning of each iteration.