API · Receiving

Retrieve Attachment

Retrieve a received email attachment with a download link that expires after one hour (requires full access). List parameters are ignored.

GET/emails/receiving/{id}/attachments/{attachmentId}Full access

Request parameters

Parameter	Type	Description
`id` path · required	`string`	Opaque resource id.
`attachmentId` path · required	`string`	Opaque resource id.

Request example

Set OPENSEND_BASE_URL=https://api.example.com and OPENSEND_API_KEY=os_replace_me on your server.

bash

curl -X GET "$OPENSEND_BASE_URL/emails/receiving/YOUR_id/attachments/YOUR_attachmentId" \
  -H "Authorization: Bearer $OPENSEND_API_KEY"

Response

200 · application/json. Example IDs stand for IDs returned by your installation.

json

{
  "object": "attachment",
  "id": "YOUR_ID",
  "filename": "example",
  "size": 0,
  "content_type": "example",
  "content_disposition": "example",
  "content_id": "YOUR_CONTENT_ID",
  "download_url": "https://api.example.com/example",
  "expires_at": "2026-09-29T12:00:00Z"
}

Behavior and errors

Download using the returned URL before expires_at. This endpoint returns metadata, not the attachment bytes.

Use a full-access credential. Resource IDs belong to your team; an unknown or foreign resource returns 404. See authentication, errors, rate limits, and compatibility for the shared contract.