+It is recommended to use an external SMTP server due to various sender requirements implemented by major email providers, but if you are testing or running a self-hosted Sentry instance on a local network, you can use the built-in SMTP server, powered by [exim4](https://hub.docker.com/r/tianon/exim4). The default configuration is set to use this server. All you need to do is to set a valid address for `mail.from` setting in `config.yml` and the [FQDN](https://en.wikipedia.org/wiki/Fully_qualified_domain_name) of your Sentry instance for `SENTRY_MAIL_HOST` in `.env`.
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