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docs(email): say that domain add refuses an apex with existing mail - #518

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Fixes #509

The email domains guide said Void "preserves foreign MX records and enabled catch-alls". That reads as if you can register an apex whose mail stays with another provider. The platform refuses that case on purpose:

void email domain add acme.com
  apex has MX records (any, on a new registration)  → 409 "already has MX records"
  catch-all routes to something else                → refused

Void never replaces another provider's mail setup. The guide now says that, in the same terms as the CLI reference (platform-email.md) and the own-account section. It points to the two options: an apex with no mail yet, or the platform's shared mail address.

Docs only. Outbound-only custom domains, the middle path the reporter mentioned, is a separate feature request.

🤖 Generated with Claude Code

The guide said Void "preserves foreign MX records", which reads as if an
apex whose mail stays with another provider can be registered. domain add
refuses an apex that already has MX records, or whose catch-all routes
elsewhere. Say so, as the CLI reference does.

Fixes #509

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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💡 Codex Review

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Reviewed commit: 1e025afdfe

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Comment thread docs/guide/email/domains.md Outdated
Running domain add again for a registered apex, for example to renew its
token, still works: the apex then has Void's own Email Routing MX.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: c854499c52

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@Brooooooklyn
Brooooooklyn merged commit 4a81795 into main Oct 21, 2026
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Brooooooklyn deleted the docs/email-domain-mx-refusal branch October 21, 2026 04:47
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Email domains guide says Void preserves foreign MX records, but domain add refuses apexes that have MX records

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