curl -X POST 'https://api.resend.com/suppressions' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '{
  "email": "steve.wozniak@gmail.com"
}'

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

> Create a suppression

## 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/suppressions' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '{"email":"steve.wozniak@gmail.com"}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| email | body | string | Yes | Email address to suppress. |

## Response (200 OK)
{"object":"suppression","id":"e169aa45-1ecf-4183-9955-b1499d5701d3"}

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

POST

/suppressions

Resend API

Create a suppression

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
→ 168 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/suppressions' \  -H "Authorization: Bearer $RESEND_API_KEY" \  -H 'User-Agent: my-app/1.0' \  -H 'Content-Type: application/json' \  -d '{  "email": "steve.wozniak@gmail.com"}'

Get a free Resend API key → sponsored

Parameters

Name	In	Type	Required	Description
email	body	string	Yes	Email address to suppress.

Response 200 OK

{
  "object": "suppression",
  "id": "e169aa45-1ecf-4183-9955-b1499d5701d3"
}