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

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

> Retrieve a single attachment for a received email

## 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 GET 'https://api.resend.com/emails/receiving/email-id/attachments/attachment-id' \
  -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 received email. |
| attachment_id | path | string | Yes | The ID of the attachment. |

## Response (200 OK)
{"object":"attachment","id":"660e8400-e29b-41d4-a716-446655440000"}

---
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GET

/emails/receiving/{email_id}/attachments/{attachment_id}

Resend API

Retrieve a single attachment for a received email

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
→ 188 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 GET 'https://api.resend.com/emails/receiving/email-id/attachments/attachment-id' \  -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 received email.
attachment_id	path	string	Yes	The ID of the attachment.

Response 200 OK

{
  "object": "attachment",
  "id": "660e8400-e29b-41d4-a716-446655440000",
  "filename": "document.pdf",
  "content_type": "application/pdf",
  "content_id": "img001",
  "content_disposition": "attachment",
  "download_url": "https://cloudfront.example.com/path?Signature=...",
  "expires_at": "2024-10-27T18:30:00.000Z",
  "size": 2048
}