diff --git a/docs/web/control-ui.md b/docs/web/control-ui.md
index 67ae9da10bb..831d4e4d987 100644
--- a/docs/web/control-ui.md
+++ b/docs/web/control-ui.md
@@ -215,7 +215,7 @@ Override the VAPID keypair through env vars on the Gateway process when you want
 
 - `OPENCLAW_VAPID_PUBLIC_KEY`
 - `OPENCLAW_VAPID_PRIVATE_KEY`
-- `OPENCLAW_VAPID_SUBJECT` (defaults to `mailto:openclaw@localhost`)
+- `OPENCLAW_VAPID_SUBJECT` (defaults to `https://openclaw.ai`)
 
 The Control UI uses these scope-gated Gateway methods to register and test browser subscriptions:
 
diff --git a/src/infra/push-web.test.ts b/src/infra/push-web.test.ts
index e5ba88a4896..9f76e030fb4 100644
--- a/src/infra/push-web.test.ts
+++ b/src/infra/push-web.test.ts
@@ -58,7 +58,11 @@ describe("resolveVapidKeys", () => {
     const keys = await resolveVapidKeys(tmpDir);
     expect(keys.publicKey).toBe("test-public-key-base64url");
     expect(keys.privateKey).toBe("test-private-key-base64url");
-    expect(keys.subject).toMatch(/^mailto:/);
+    expect(keys.subject).toBe("https://openclaw.ai");
+    const persistedKeys = JSON.parse(
+      await fs.readFile(path.join(tmpDir, "push", "vapid-keys.json"), "utf8"),
+    ) as { subject?: string };
+    expect(persistedKeys.subject).toBe("https://openclaw.ai");
 
     // Second call returns same keys.
     const keys2 = await resolveVapidKeys(tmpDir);
@@ -211,7 +215,7 @@ describe("sending", () => {
     expect(result.ok).toBe(true);
     expect(vi.mocked(webPush.setVapidDetails)).toHaveBeenCalledTimes(1);
     expect(vi.mocked(webPush.setVapidDetails)).toHaveBeenCalledWith(
-      "mailto:openclaw@localhost",
+      "https://openclaw.ai",
       "test-public-key-base64url",
       "test-private-key-base64url",
     );
diff --git a/src/infra/push-web.ts b/src/infra/push-web.ts
index e1c35011361..5fc8ca4576b 100644
--- a/src/infra/push-web.ts
+++ b/src/infra/push-web.ts
@@ -36,7 +36,7 @@ const WEB_PUSH_STATE_FILENAME = "push/web-push-subscriptions.json";
 const VAPID_KEYS_FILENAME = "push/vapid-keys.json";
 const MAX_ENDPOINT_LENGTH = 2048;
 const MAX_KEY_LENGTH = 512;
-const DEFAULT_VAPID_SUBJECT = "mailto:openclaw@localhost";
+const DEFAULT_VAPID_SUBJECT = "https://openclaw.ai";
 
 const withLock = createAsyncLock();