Adds email addresses to the workspace's sequence unsubscribe list. Email addresses on the unsubscribe list cannot be enrolled in any sequence, and any of their active sequence runs are exited. Email addresses that are already on the unsubscribe list are ignored, so this endpoint is safe to retry.

This endpoint is in beta. We will aim to avoid breaking changes, but small updates may be made as we roll out to more users.

Required scopes: sequence_unsubscribe:read-write.

Supported token levels: workspace, user.

{
  "data": {
    "email_addresses": [
      "person@example.com"
    ]
  }
}

{
  "data": [
    {
      "email_address": "person@example.com",
      "created_at": "2026-01-02T15:04:05.000Z"
    }
  ]
}