 
            return array(
    ... other options ...
    'driver' => 'smtp',   // duh!
    'smtp' => array(
        'host' => 'ssl://smtp.gmail.com',
        'port' => 465,
        'username' => 'googleusername',
        'password' => 'googlepassword',
        'timeout' => 5  // this can be whatever you want
    ),
    'newline' => "\r\n"
);
Troubleshooting:
1. Not authorized 
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