# Adjusting mxisd Identity Server configuration (optional)
By default, this playbook configures an [mxisd](https://github.com/kamax-io/mxisd) Identity Server for you.
This server is private by default, potentially at the expense of user discoverability.
## Matrix.org lookup forwarding
To ensure maximum discovery, you can make your identity server also forward lookups to the central matrix.org Identity server (at the cost of potentially leaking all your contacts information).
Enabling this is discouraged and you'd better [learn more](https://github.com/kamax-io/mxisd/blob/master/docs/features/identity.md#lookups) before proceeding.
Enabling matrix.org forwarding can happen with the following configuration:
```yaml
matrix_mxisd_matrixorg_forwarding_enabled: true
```
## Additional features
What this playbook configures for your is some bare minimum Identity Server functionality, so that you won't need to rely on external 3rd party services.
To use a more custom configuration, you can define a `matrix_mxisd_configuration_extension_yaml` string variable
and put your configuration in it.
To learn more about how to do this, refer to the information about `matrix_mxisd_configuration_extension_yaml` in the [default variables file](../roles/matrix-server/defaults/main.yml).
If email address validation emails sent by mxisd are not reaching you, you should look into [Adjusting email-sending settings](configuring-playbook-email.md).