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Custom domains.

Add a domain, publish DNS, and wait for verification.

Settings → Domains unlocks after the custom-domain add-on (or a plan that includes it). Extra domains are a separate add-on after the first.

ZanonMail checks the DNS records it asked you to publish. Status is Waiting, Verified, or Problem. It does not invent a reputation score.

Catch-all is a domain-level setting on the mail server once the domain is verified.