post_install(){
  cat <<INFO
NOTE: Before starting stalwart-mail.service, create an admin password using
      \`openssl passwd -6\` and set it with drop-in file.
      using \`systemctl edit stalwart-mail.service\` with
      """
      [Service]
      Environment=ADMIN_SECRET=<get from \`openssl passwd -6\`>
      """
      or just 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
}

