diff --git a/manifest.json b/manifest.json
index 7a0f6f6..b55cc7a 100644
--- a/manifest.json
+++ b/manifest.json
@@ -70,7 +70,8 @@
         "https://mail.163.com/*",
         "https://*.mail.163.com/*",
         "https://webmail.vip.163.com/*",
-        "https://mail.126.com/*"
+        "https://mail.126.com/*",
+        "https://*.mail.126.com/*"
       ],
       "js": [
         "content/activation-utils.js",
diff --git a/tests/mail-163-manifest.test.js b/tests/mail-163-manifest.test.js
new file mode 100644
index 0000000..f922c14
--- /dev/null
+++ b/tests/mail-163-manifest.test.js
@@ -0,0 +1,22 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+
+test('manifest 为网易邮箱内容脚本覆盖 126 子域名', () => {
+  const manifest = JSON.parse(fs.readFileSync('manifest.json', 'utf8'));
+  const mail163Script = manifest.content_scripts.find((script) => (
+    Array.isArray(script.js) && script.js.includes('content/mail-163.js')
+  ));
+
+  assert.ok(mail163Script, '应存在 mail-163 内容脚本声明');
+  assert.equal(
+    mail163Script.matches.includes('https://mail.126.com/*'),
+    true,
+    '应覆盖 mail.126.com'
+  );
+  assert.equal(
+    mail163Script.matches.includes('https://*.mail.126.com/*'),
+    true,
+    '应覆盖 *.mail.126.com'
+  );
+});