$options = array_merge($options, array('ssl' => array('allow_self_signed' => true, 'verify_peer' => false)));
        if (isset($this->params['stream_context_options'])) {
            $options = array_merge($options, $this->params['stream_context_options']);
        }

swiftmailer:
  transport: gmail
  username: ***
  password: ***
  host: localhost
  port: 465
  encryption: ssl
  auth-mode: login
  spool: { type: 'memory' }
  stream_options:
    ssl:
      allow_self_signed: true
      verify_peer: false
      verify_peer_name: false