Core_Email::_send_with_smtp

protected function _send_with_smtp()
{
    if ($this->smtp_host === '')
    {
        $this->_set_error_message('lang:email_no_hostname');
        return false;
    }

    if ( ! $this->_smtp_connect() || ! $this->_smtp_authenticate())
    {
        return false;
    }

    $this->_send_command('from', $this->clean_email($this->_headers['From']));

    foreach ($this->_recipients as $val)
    {
        $this->_send_command('to', $val);
    }

    if (count($this->_cc_array) > 0)
    {
        foreach ($this->_cc_array as $val)
        {
            if ($val !== '')
            {
                $this->_send_command('to', $val);
            }
        }
    }

    if (count($this->_bcc_array) > 0)
    {
        foreach ($this->_bcc_array as $val)
        {
            if ($val !== '')
            {
                $this->_send_command('to', $val);
            }
        }
    }

    $this->_send_command('data');

    // perform dot transformation on any lines that begin with a dot
    $this->_send_data($this->_header_str.preg_replace('/^\./m', '..$1', $this->_finalbody));

    $this->_send_data('.');

    $reply = $this->_get_smtp_data();

    $this->_set_error_message($reply);

    if (strpos($reply, '250') !== 0)
    {
        $this->_set_error_message('lang:email_smtp_error', $reply);
        return false;
    }

    $this->_send_command('quit');
    return true;
}