diff --git a/app/mailers/notify.rb b/app/mailers/notify.rb
index 4180e76e1a074b0f0fec68233523202f7edcd6a2..77d32a55941a312e7d887682e29e22bcb3a9aebb 100644
--- a/app/mailers/notify.rb
+++ b/app/mailers/notify.rb
@@ -208,6 +208,7 @@ def add_model_headers(object)
 
     headers["#{prefix}-ID"] = object.id
     headers["#{prefix}-IID"] = object.iid if object.respond_to?(:iid)
+    headers["#{prefix}-State"] = object.state if object.respond_to?(:state)
   end
 
   def add_project_headers
diff --git a/doc/user/profile/notifications.md b/doc/user/profile/notifications.md
index ba8c83e31063a9fc65f261c638b2948929a03198..706065d46934e8323c56efa472f6b73f9d986354 100644
--- a/doc/user/profile/notifications.md
+++ b/doc/user/profile/notifications.md
@@ -368,20 +368,21 @@ a merge request or an issue.
 
 The following table lists all GitLab-specific email headers:
 
-| Header                                                        | Description                                                                                                                                    |
-| ------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
-| `List-Id`                                                     | The path of the project in an RFC 2919 mailing list identifier. You can use it for email organization with filters.                            |
-| `X-GitLab-(Resource)-ID`                                      | The ID of the resource the notification is for. The resource, for example, can be `Issue`, `MergeRequest`, `Commit`, or another such resource. |
-| `X-GitLab-ConfidentialIssue`                                  | The boolean value indicating issue confidentiality for notifications. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/222908) in GitLab 16.0. |
-| `X-GitLab-Discussion-ID`                                      | The ID of the thread the comment belongs to, in notification emails for comments.                                                              |
-| `X-GitLab-Group-Id`                                           | The group's ID. Only present on notification emails for [epics](../group/epics/index.md).                                                      |
-| `X-GitLab-Group-Path`                                         | The group's path. Only present on notification emails for [epics](../group/epics/index.md)                                                     |
-| `X-GitLab-NotificationReason` | The reason for the notification. [See possible values.](#x-gitlab-notificationreason). |
-| `X-GitLab-Pipeline-Id`                                        | The ID of the pipeline the notification is for, in notification emails for pipelines.                                                          |
-| `X-GitLab-Project-Id`                                         | The project's ID.                                                                                                                              |
-| `X-GitLab-Project-Path`                                       | The project's path.                                                                                                                            |
-| `X-GitLab-Project`                                            | The name of the project the notification belongs to.                                                                                           |
-| `X-GitLab-Reply-Key`                                          | A unique token to support reply by email.                                                                                                      |
+| Header                        | Description                                                                                                                                                                 |
+| ----------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `List-Id`                     | The path of the project in an RFC 2919 mailing list identifier. You can use it for email organization with filters.                                                         |
+| `X-GitLab-(Resource)-ID`      | The ID of the resource the notification is for. The resource, for example, can be `Issue`, `MergeRequest`, `Commit`, or another such resource.                              |
+| `X-GitLab-(Resource)-State`   | The state of the resource the notification is for. The resource can be, for example, `Issue` or `MergeRequest`. The value can be `opened`, `closed`, `merged`, or `locked`. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/130967) in GitLab 16.4. |
+| `X-GitLab-ConfidentialIssue`  | The boolean value indicating issue confidentiality for notifications. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/222908) in GitLab 16.0.                    |
+| `X-GitLab-Discussion-ID`      | The ID of the thread the comment belongs to, in notification emails for comments.                                                                                           |
+| `X-GitLab-Group-Id`           | The group's ID. Only present on notification emails for [epics](../group/epics/index.md).                                                                                   |
+| `X-GitLab-Group-Path`         | The group's path. Only present on notification emails for [epics](../group/epics/index.md)                                                                                  |
+| `X-GitLab-NotificationReason` | The reason for the notification. [See possible values.](#x-gitlab-notificationreason).                                                                                      |
+| `X-GitLab-Pipeline-Id`        | The ID of the pipeline the notification is for, in notification emails for pipelines.                                                                                       |
+| `X-GitLab-Project-Id`         | The project's ID.                                                                                                                                                           |
+| `X-GitLab-Project-Path`       | The project's path.                                                                                                                                                         |
+| `X-GitLab-Project`            | The name of the project the notification belongs to.                                                                                                                        |
+| `X-GitLab-Reply-Key`          | A unique token to support reply by email.                                                                                                                                   |
 
 ### X-GitLab-NotificationReason
 
diff --git a/spec/support/shared_examples/mailers/notify_shared_examples.rb b/spec/support/shared_examples/mailers/notify_shared_examples.rb
index cf1ab7697ab954485eb9ff7f7f00284615e2f304..987060d73b9bcd29269ef59d925887dbf2cd5e1e 100644
--- a/spec/support/shared_examples/mailers/notify_shared_examples.rb
+++ b/spec/support/shared_examples/mailers/notify_shared_examples.rb
@@ -54,6 +54,14 @@
       expect(subject.header["X-GitLab-#{model.class.name}-IID"]).to eq nil
     end
   end
+
+  it 'has X-GitLab-*-State header if model has state defined' do
+    if model.respond_to?(:state)
+      is_expected.to have_header "X-GitLab-#{model.class.name}-State", model.state.to_s
+    else
+      expect(subject.header["X-GitLab-#{model.class.name}-State"]).to eq nil
+    end
+  end
 end
 
 RSpec.shared_examples 'an email with X-GitLab headers containing project details' do