Suppressions

Suppressions API

Manage unsubscribe groups and email suppressions. Suppressions prevent emails from being sent to recipients who have opted out, bounced, or complained.

Unsubscribe Groups

GET /v1/unsubscribe-groups

List all unsubscribe groups for the organization.

{
  "data": [
    {
      "id": "grp-uuid",
      "organizationId": "org-uuid",
      "name": "Marketing",
      "description": "Weekly newsletter and promotions",
      "isDefault": true,
      "createdAt": "2025-01-10T08:00:00Z"
    },
    {
      "id": "grp-uuid-2",
      "organizationId": "org-uuid",
      "name": "Product Updates",
      "description": "Feature announcements and release notes",
      "isDefault": false,
      "createdAt": "2025-01-10T08:00:00Z"
    }
  ]
}

POST /v1/unsubscribe-groups

Create a new unsubscribe group. If isDefault is set to true, any existing default group is unset.

Request Body

Field	Type	Required	Description
name	string	Yes	Group name (max 255 chars).
description	string	No	Group description (max 2,000 chars).
isDefault	boolean	No	Whether this is the default group (default: false).

Response

Status: 201 Created

{
  "data": {
    "id": "grp-uuid",
    "organizationId": "org-uuid",
    "name": "Marketing",
    "description": "Weekly newsletter and promotions",
    "isDefault": true,
    "createdAt": "2025-01-10T08:00:00Z"
  }
}

PATCH /v1/unsubscribe-groups/:id

Update a group’s name, description, or default status.

DELETE /v1/unsubscribe-groups/:id

Delete a group. All suppressions in the group are cascade-deleted.

---

Suppressions

GET /v1/suppressions

List suppressions with filtering and pagination.

Query Parameters

Parameter	Type	Default	Description
page	integer	1	Page number.
limit	integer	20	Items per page (max 100).
source	string	—	Filter by source: BOUNCE, COMPLAINT, MANUAL, IMPORT, UNSUBSCRIBE.
groupId	string	—	Filter by unsubscribe group.

Response

{
  "data": [
    {
      "id": "sup-uuid",
      "organizationId": "org-uuid",
      "emailHash": "sha256...",
      "unsubscribeGroupId": "grp-uuid",
      "source": "UNSUBSCRIBE",
      "createdAt": "2025-01-12T15:00:00Z"
    }
  ],
  "pagination": { "page": 1, "limit": 20, "total": 42, "totalPages": 3 }
}

POST /v1/suppressions

Manually add a suppression.

Request Body

Field	Type	Required	Description
email	string	Yes	Email address to suppress. Stored as a SHA-256 hash.
unsubscribeGroupId	string	No	Scope the suppression to a specific group.
source	string	No	Source of the suppression: BOUNCE, COMPLAINT, MANUAL, IMPORT, UNSUBSCRIBE. Default: MANUAL.

Response

Status: 201 Created

{
  "data": {
    "id": "sup-uuid",
    "organizationId": "org-uuid",
    "emailHash": "sha256...",
    "unsubscribeGroupId": "grp-uuid",
    "source": "MANUAL",
    "createdAt": "2025-01-12T15:00:00Z"
  }
}

If the suppression already exists, the API returns 409 Conflict.

DELETE /v1/suppressions/:id

Remove a suppression, allowing emails to be sent to that address again.

POST /v1/suppressions/import

Bulk import suppressions from a list of email addresses. Duplicates are silently skipped.

Request Body

Field	Type	Required	Description
emails	string[]	Yes	Email addresses to suppress (1 to 10,000).
unsubscribeGroupId	string	No	Scope all suppressions to a specific group.

Response

{
  "data": {
    "imported": 847,
    "skipped": 153,
    "total": 1000
  }
}

---

Public Unsubscribe Endpoint

GET /v1/unsubscribe/:token

This is a public endpoint (no authentication required). It handles unsubscribe link clicks from email recipients.

The :token is an HMAC-signed payload containing the organization ID, unsubscribe group, and recipient email. When a user clicks the link:

1. The HMAC token is verified
2. A suppression record is created
3. The action is logged in the audit trail
4. A confirmation HTML page is displayed

Invalid or expired tokens display an error page.

This endpoint is called automatically when recipients click the unsubscribe link that Optail injects into emails sent with an unsubscribeGroupId.