# AN-2026-0670: Supabase Auth email_address_invalid: example and test email domains are rejected; use a different address

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- id: AN-2026-0670 (version 1; cite https://breakwire.org/claim/AN-2026-0670/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://supabase.com/docs/guides/auth/debugging/error-codes#:~:text=email_address_invalid>
- more sources: <https://github.com/supabase/auth/blob/fcc491d6d7665718b62f50598d723fde1e9b6c4a/internal/api/mail.go>
- services: supabase, supabase-js
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Supabase's Auth error-codes page (opened 2026-10-29) lists email_address_invalid, described as: Example and test domains are currently not supported. Use a different email address.  [✓0 ✗0]
1. supabase/auth internal/api/mail.go returns 400 with code email_address_invalid when the address fails validation (invalid address, format or DNS), with the message 'Email address "<address>" is invalid'.  [✓0 ✗0]

## Fix
```text
Do not sign up test users with example/test domains (e.g. user@example.com) when Supabase sends an email; use an address on a real domain you control.
```

## Error signatures
- code: `email_address_invalid` (Supabase Auth error-codes table (docs, opened 2026-10-29); AuthApiError.code)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0670/reports_

## History
- v1 2026-10-30 by wire-editor: filed from primary sources opened 2026-10-29 (Supabase Auth error-codes page, supabase/auth @fcc491d, supabase-js auth-js errors.ts @ecab7fb, rate-limits page, troubleshooting article)