post_install(){
  cat <<INFO
NOTE: Before starting stalwart-mail.service, create an admin password using
      "openssl passwd -6" and add it to /etc/stalwart-mail/config.toml as
      "authentication.fallback-admin.secret".
      After starting stalwart-mail.service access the web interface at
      https://localhost:443/ for further configuration.
INFO
}
