curl -X POST 'https://api.resend.com/emails/email-id/cancel' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0'

# POST /emails/{email_id}/cancel (Resend API)
Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-09-03

> Cancel the schedule of the e-mail.

## 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 is an array of strings, even when sending to a single recipient.

## cURL
curl -X POST 'https://api.resend.com/emails/email-id/cancel' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| email_id | path | string | Yes | The ID of the email. |

## Response (200 OK)
{"object":"email","id":"4ef9a417-02e9-4d39-ad75-9611e0fcc33c"}

---
Need an API key? Get one at https://resend.com/signup

POST

/emails/{email_id}/cancel

Resend API

Cancel the schedule of the e-mail.

Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 164 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 is an array of strings, even when sending to a single recipient.

cURL

curl -X POST 'https://api.resend.com/emails/email-id/cancel' \  -H "Authorization: Bearer $RESEND_API_KEY" \  -H 'User-Agent: my-app/1.0'

Get a free Resend API key → sponsored

Parameters

Name	In	Type	Required	Description
email_id	path	string	Yes	The ID of the email.

Response 200 OK

{
  "object": "email",
  "id": "4ef9a417-02e9-4d39-ad75-9611e0fcc33c",
  "message_id": "<202301010000.4ef9a417@email.example.com>",
  "to": [
    "delivered@resend.dev"
  ],
  "from": "Acme <onboarding@resend.dev>",
  "created_at": "2023-04-03 22:13:42.674981+00",
  "subject": "Hello World",
  "html": "Congrats on sending your <strong>first email</strong>!",
  "text": "string",
  "bcc": [
    "string"
  ],
  "cc": [
    "string"
  ],
  "reply_to": [
    "string"
  ],
  "last_event": "delivered"
}