Email Class SSL verification bug on PHP 5.6 (SSL3_GET_SERVER_CERTIFICATE)

@Avenirer Could you be more specific?

@Rômulo and @Rufnex, I solve this problem, and I wrote about in this post on my blog at: here [PT-BR]
Its a simple problem about openssl.cafile set on php.ini (PHP 5.6+)

That error is related to the firewall settings of your server... I think... and not to CodeIgniter.

So, was I right? It was a problem with the firewall and the ports?

I get solve this problem :

Edit File System/libraries/Email.php 

function _smtp_connect
change fsockopen to stream_socket_client
$context = stream_context_create([
            'ssl' => [
                'verify_peer' => false,
                'verify_peer_name' => false
            ]
        ]);


$this->_smtp_connect = stream_socket_client($ssl.$this->smtp_host . ':' 
                                        . $this->smtp_port,
                                        $errno,
                                        $errstr,
                                        $this->smtp_timeout,STREAM_CLIENT_CONNECT, $context);