# mail.rules.save

Manage exact vendor sender authorization with an active finance sponsor and revision checks.

`POST /api/v1/accounting/mail.rules.save`

Permissions: `mail:read`, `mail:write`, `accounting:admin` · Roles: admin · Idempotency key required · Send `expectedRevision`

MCP tool: `accounting_mail_rules_save`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `id` | string (ID) |  | The record's ID. |
| `expectedRevision` | integer |  | The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again. at most 9007199254740991; greater than 0. |
| `email` | string (email) | Yes | An email address. at most 320 characters. |
| `sponsorUserId` | string | Yes | 1–200 characters. |
| `active` | boolean | Yes | Whether the record is turned on. |
| `idempotencyKey` | string | Yes | Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match. 8–160 characters. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/mail.rules.save \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "email": "finance@example.com",
  "sponsorUserId": "example",
  "active": true
}'
```

Reference page: https://app.getoatmilk.com/docs/api/mail.rules.save