As all programs from `Baguette` repositories, a configuration file either in the `$XDG_CONFIG_HOME/baguette/` (first guess) or in the `/etc/baguette/` directory can be used.
Here an exhaustive example:
```YAML
# ~/.config/baguette/mailer.yml
# SMTPd configuration.
smtpd_host: localhost
smtpd_port: 25
# Where to find templates, if not in the defaut directory (/etc/baguette/mailer/templates/).