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## Summary
Two related email changes:
### 1. Send to arbitrary email addresses
The `sendEmail` SDK function and `POST /api/v1/emails/send-email` now
accept a third recipient selector, **`emails: string[]`**, mutually
exclusive (XOR) with `user_ids` and `all_users`. These recipients don't
have to belong to a user — they're mapped to the existing internal
`custom-emails` recipient type (no associated user object, can't
unsubscribe, so intended for transactional mail).
- Response `results` items are now `{ user_id?, email? }`; the `emails`
path returns `{ email }`.
- Validation message updated to `Exactly one of user_ids, all_users, or
emails must be provided`.
- Recipient addresses are validated with the shared `emailSchema`.
### 2. Run Emailable on managed custom domains
`LowLevelEmailConfig.type` is widened `'shared' | 'standard'` →
`'shared' | 'managed' | 'standard'`, and `getEmailConfig` returns
`'managed'` for the managed-Resend branch. The Emailable deliverability
check now runs for **shared** and **managed**, and is skipped for
**`standard`** (a customer's own SMTP server or Resend API key).
**Why:** managed domains send through our single Resend *account*
(per-domain scoped keys, but shared account → account-level bounce
penalties are collateral across managed customers), so we own that
reputation. With a custom SMTP server or the customer's own Resend key,
the customer owns their deliverability, so we don't second-guess their
recipients or spend Emailable checks on their volume. The shared
dev-email wrapper remains `shared`-only.
## Tests
- `send-email.test.ts`: added arbitrary-recipient send
(single/multiple), empty-array, and validation cases (both-selectors,
no-selector, invalid email); updated the exactly-one-of snapshot.
**24/24 pass.**
- New `emails/deliverability-gating.test.ts`: shared & managed skip an
undeliverable address (`LIKELY_NOT_DELIVERABLE`), custom SMTP still
sends. **3/3 pass.**
> Note: `email-queue.test.ts` has 2 pre-existing snapshot failures (a
`margin:0rem`→`margin:0` CSS normalization in rendered email HTML) that
are unrelated to this change — confirmed by reproducing them on `dev`
with these changes stashed.
<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Adds support for sending emails to arbitrary addresses and enables
Emailable checks for managed domains to protect shared sending
reputation. The API/SDK now accept `emails: string[]` as a recipient
selector, and deliverability checks run on shared and managed sending.
- New Features
- API/SDK: `emails: string[]` recipient selector (XOR with
`user_ids`/`all_users`) in `sendEmail` and POST
/api/v1/emails/send-email. Results return `{ email }` for this path;
addresses validated via `emailSchema`. Recipients map to
transactional-only “custom-emails” (no user, no unsubscribe).
- Deliverability: email config adds `'managed'`; `getEmailConfig`
returns it for managed Resend domains. Emailable check runs for `shared`
and `managed`; skipped for `standard` (custom SMTP or customer Resend
key).
<sup>Written for commit
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| cli | ||
| dashboard-ui-components | ||
| js | ||
| next | ||
| react | ||
| sc | ||
| shared | ||
| shared-backend | ||
| tanstack-start | ||
| template | ||
| ui | ||
