By default, your server federates with the whole Matrix network. That is, people on your server can communicate with people on any other Matrix server.
**Note**: in the sample `vars.yml` ([`examples/vars.yml`](../examples/vars.yml)), we recommend to use a short user identifier like `@<username>:example.com` and set up [server delegation](howto-server-delegation.md) / redirection. Without a proper configuration, your server will effectively not be part of the Matrix network. If you find your server is not federated, make sure to [check whether services work](maintenance-checking-services.md) and your server is properly delegated.
Suguru Hirahara
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