Connection could not be established with host smtp.office365.com [ #0] on IIS server

I'm trying to send an email from Office365 using Laravel from IIS server. I'm getting this error: Connection could not be established with host smtp.office365.com [ #0]

I'm using tls with port 587.

I also tried 465 port but it didn't work. below is the code from where i'm getting this error

if (isset($this->params['stream_context_options'])) {
        $options = array_merge($options, $this->params['stream_context_options']);
    }
    $streamContext = stream_context_create($options);
    $this->stream = @stream_socket_client($host.':'.$this->params['port'], $errno, $errstr, $timeout, STREAM_CLIENT_CONNECT, $streamContext);
    if (false === $this->stream) {
        throw new Swift_TransportException(
            'Connection could not be established with host '.$this->params['host'].
            ' ['.$errstr.' #'.$errno.']'
            );
    }

via Chebli Mohamed