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SuperMail docs

Custom domains overview

A custom domain in SuperMail is a domain you own (e.g. yourdomain.com) that you’ve attached to your workspace. Once configured, you can:

  • Receive mail at any address on that domain (catch-all or per-alias).
  • Send mail from any address on that domain.
  • Reply from the address the original message was sent to.

Custom domains are the core of the multi-domain workflow. Each custom domain you add uses one of your plan’s account slots - the same pool you’d otherwise spend on personal mailboxes like Gmail or Outlook. There is no separate domain quota; on a 3-slot plan you could go all domains, all mailboxes, or any mix. See Plans and billing for slot counts per plan.

Custom domain settings with verified and pending domains

How it works

Behind the scenes, SuperMail uses industry-standard email sending and receiving so messages from your domain are authenticated and delivered reliably. Incoming mail appears in your SuperMail inbox, usually within seconds.

The steps

  1. Add a domain to your workspace.
  2. Configure DNS records (MX, DKIM, SPF, DMARC).
  3. Verify - we check DNS and enable the domain once records propagate.
  4. Set up sending (add send profiles for your addresses).
  5. Configure receiving (catch-all vs per-alias routing).

When something goes wrong, see Troubleshooting.