> ## Documentation Index
> Fetch the complete documentation index at: https://docs.opal.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Notifications

> Learn about the types of notifications sent by Opal.

The following are notifications sent by Opal, based on certain events or at a specified frequency. Users can unsubscribe to email or Slack notifications from **Settings > Notification Preferences** in the lower left corner.

| Notification type                                                                                          | Recipients                                    | Email | Slack | Google Chat | Configuration                                                                   |
| ---------------------------------------------------------------------------------------------------------- | --------------------------------------------- | ----- | ----- | ----------- | ------------------------------------------------------------------------------- |
| Access review assigned to reviewers                                                                        | Reviewers                                     | ✔️    | ✔️    | ✔️          | [Access review settings](/docs/access-reviews#set-notifications)                |
| Incomplete access review reminders                                                                         | Managers if enabled, reviewers                | ✔️    | ✔️    | ✔️          | [Access review settings](/docs/access-reviews#set-notifications)                |
| Access reviews require access to be revoked on end systems                                                 | Auditors                                      | ✔️    | ✔️    |             |                                                                                 |
| Access revoked due to access reviews                                                                       | Revoked users                                 | ✔️    | ✔️    |             |                                                                                 |
| Access expired                                                                                             | Users with expired access                     | ✔️    | ✔️    |             |                                                                                 |
| Resources imported to Opal                                                                                 | Owners of connection/app containing resources | ✔️    | ✔️    |             |                                                                                 |
| User invited to Opal                                                                                       | Invited user                                  | ✔️    |       |             |                                                                                 |
| Access requested                                                                                           | Reviewers                                     | ✔️    | ✔️    | ✔️          |                                                                                 |
| Access requested on behalf of another user                                                                 | Requestor, affected user, and reviewers       | ✔️    | ✔️    |             |                                                                                 |
| User comments on access requests                                                                           | Reviewers                                     | ✔️    | ✔️    |             |                                                                                 |
| Access request approved or denied                                                                          | Requestors                                    | ✔️    | ✔️    |             |                                                                                 |
| Access request canceled                                                                                    | Reviewers                                     | ✔️    | ✔️    |             |                                                                                 |
| Access is expiring soon                                                                                    | Users with expiring access, Group leaders     | ✔️    | ✔️    |             | **Configuration Settings** > **Advanced** > **Access expiration notifications** |
| Access propagation failed or [owner groups are empty](/docs/configure-reviewers#empty-owner-notifications) | Admins and/or Owners                          | ✔️    | ✔️    |             | **Configuration Settings** > **Advanced** > **Error notification setting**      |
| Manual ticket propagation successful                                                                       | Requestors                                    |       | ✔️    |             |                                                                                 |