curl -X POST 'https://api.resend.com/emails/batch' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '[
  {
    "from": "Acme <onboarding@resend.dev>",
    "to": [
      "delivered@resend.dev"
    ],
    "subject": "Hello World",
    "html": "<p>It works!</p>"
  }
]'

# POST /emails/batch (Resend API)
Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-10-20

> Trigger up to 100 batch emails at once.

## Critical Gotchas
* All requests must include a `User-Agent` header (e.g. `User-Agent: my-app/1.0`) or the API returns HTTP 403.
* The `to` field accepts either a single recipient email address string or an array of strings for multiple recipients (max 50).

## cURL
curl -X POST 'https://api.resend.com/emails/batch' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '[{"from":"Acme <onboarding@resend.dev>","to":["delivered@resend.dev"],"subject":"Hello World","html":"<p>It works!</p>"}]'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| body | body | object[] | No | Request body. |

## Response (200 OK)
{"data":[{"id":"string"}]}

---
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POST

POST /emails/batch — Resend API

Resend API

Trigger up to 100 batch emails at once.

Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-10-20 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 184 tokens · Vary: Accept

Critical gotchas

All requests must include a User-Agent header (e.g. User-Agent: my-app/1.0) or the API returns HTTP 403.

The to field accepts either a single recipient email address string or an array of strings for multiple recipients (max 50).

cURL

curl -X POST 'https://api.resend.com/emails/batch' \  -H "Authorization: Bearer $RESEND_API_KEY" \  -H 'User-Agent: my-app/1.0' \  -H 'Content-Type: application/json' \  -d '[  {    "from": "Acme <[email protected]>",    "to": [      "[email protected]"    ],    "subject": "Hello World",    "html": "<p>It works!</p>"  }]'

Parameters

Name	In	Type	Required	Description
body	body	object[]	No	Request body.

Response 200 OK

{
  "data": [
    {
      "id": "string"
    }
  ]
}

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