Sending multiple emails using zen_mail

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Hi,

I'm trying to invoke zen_mail twice so that I can send an email to myself (admin) and my customer. I'm using the following to invoke it but I cannot seem to get it to work. When I do call it, it causes the emails not to send out. Can anyone help?

      zen_mail($customer['customers_firstname'] . " " . $customer['customers_lastname'],
           $admin,
           $subject,
           $text,
           TITLE,
           $admin['admin_email'],
           $block,
           $module_used
           );