# Send Test Email
> Send one real email through a campaign's sending account.
Requires an API key with the `write` scope.
**This sends a real email** from one of the campaign's sending accounts to the address you give. It is not a dry run: use [Preview Campaign Email](/api-reference/campaigns/preview-campaign-email) to see copy without sending.
The email counts against the account's daily limit and the workspace's monthly limit, is logged as a campaign email, and updates the campaign's sent counters. `{spin|syntax}` and `{{merge}}` tags are filled in. The same checks run as for a message sent from the app: the address is refused when it belongs to a lead that has bounced, unsubscribed or failed verification, or when it is on the block list. A List-Unsubscribe header is added when the campaign needs one.
A delivery failure at the mail server is not an HTTP error: you get `200` with `success: false` and the `error`.
## Path Parameters
The campaign.
## Request Body
Recipient. Any address; a real email goes to it.
A sending account assigned to this campaign. It must be active and connected.
Subject, up to 500 characters.
Body, up to 200,000 characters.
Send as HTML instead of plain text.
Preview text, up to 300 characters. HTML sends only.
Fill merge tags from this lead in the campaign.
## Response
Whether the mail server accepted the email.
The Message-ID when it was sent.
The mail server error when it was not.
```bash cURL
curl -X POST "https://api.foxreach.io/api/v1/campaigns/cmcamp1/test-email" \
-H "X-API-Key: otr_your_key" \
-H "Content-Type: application/json" \
-d '{"toEmail": "you@example.com", "accountId": "cmacct1", "subject": "Test", "body": "Hello"}'
```
```python Python SDK
from foxreach import FoxReach
client = FoxReach(api_key="otr_your_key")
result = client.campaigns.send_test_email(
"cmcamp1", to_email="you@example.com", account_id="cmacct1", subject="Test", body="Hello",
)
```
```typescript TypeScript SDK
import { FoxReach } from "foxreach";
const client = new FoxReach({ apiKey: "otr_your_key" });
const result = await client.campaigns.sendTestEmail("cmcamp1", {
toEmail: "you@example.com", accountId: "cmacct1", subject: "Test", body: "Hello",
});
```
```json
{
"data": { "success": true, "messageId": "", "error": null }
}
```
## Errors
| Status | Description |
|--------|-------------|
| `401` | Missing, invalid, revoked or expired API key |
| `403` | API key does not have the required scope: `write` |
| `400` | The account is not on this campaign, not active or not connected, or the address bounced, unsubscribed, failed verification or is blocked |
| `404` | Campaign or sending account not found in this workspace |
| `429` | The account's daily limit or the workspace's monthly send limit is reached, or the `expensive` rate limit is |
| `503` | The block list could not be checked; try again |
## Rate Limit
- **100 requests per minute, shared by every `expensive` call in your workspace.** Fixed 60-second window.
- Every response includes `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset` (unix epoch seconds) and `X-RateLimit-Bucket` (`expensive`).
- A `429` response includes a `Retry-After` header (seconds until the bucket resets).
For client-side patterns (`Retry-After`, exponential backoff, monitoring `X-RateLimit-Remaining`), see [Rate Limiting](/rate-limiting).