depot/cluster/services/mail/certificate.nix

{ depot, lib, ... }:

{
  security.acme.certs."mail.${depot.lib.meta.domain}" = {
    dnsProvider = "exec";
    webroot = lib.mkForce null;
    extraDomainNames = map (x: "${x}.${depot.lib.meta.domain}") [
      "mx"
      "imap"
      "smtp"
    ];
  };
}