USING GMAIL : SMTP Error (-1): Connection to server failed.

[vaff]

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$rcmail_config['smtp_server'] = 'ssl://smtp.gmail.com';

// SMTP port (default is 25; use 587 for STARTTLS or 465 for the
// deprecated SSL over SMTP (aka SMTPS))
$rcmail_config['smtp_port'] = 465;

// SMTP username (if required) if you use %u as the username Roundcube
// will use the current username for login
$rcmail_config['smtp_user'] = '%u';

// SMTP password (if required) if you use %p as the password Roundcube
// will use the current user's password for login
$rcmail_config['smtp_pass'] = '%p';

// SMTP AUTH type (DIGEST-MD5, CRAM-MD5, LOGIN, PLAIN or empty to use
// best server supported one)
$rcmail_config['smtp_auth_type'] = null;

// Optional SMTP authentication identifier to be used as authorization proxy
$rcmail_config['smtp_auth_cid'] = null;

// Optional SMTP authentication password to be used for smtp_auth_cid
$rcmail_config['smtp_auth_pw'] = null;

// SMTP HELO host
// Hostname to give to the remote server for SMTP 'HELO' or 'EHLO' messages
// Leave this blank and you will get the server variable 'server_name' or
// localhost if that isn't defined.
$rcmail_config['smtp_helo_host'] = '';

// SMTP connection timeout, in seconds. Default: 0 (no limit)
$rcmail_config['smtp_timeout'] = 0;

my current setup .

please help i can receive but cant send.