@ruben We don't currently allow whitelabel email hosting via Librem One. So, for example, if you're trying to set Librem One as the MX records for your domain, it won't work.
That said, you could set up a forwarding rule to your Librem One account.
@purism I did just that, but then mails can't be forwarded because of missing SPF records, Librem seems to require. Unfortunately these can't be set correctly when forwarding mails.