diff --git a/src/standard-validators.js b/src/standard-validators.js
index 1929b36..a3435a8 100644
--- a/src/standard-validators.js
+++ b/src/standard-validators.js
@@ -312,7 +312,8 @@ export function config (validation) {
   ]);
 
   // email regex from https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address
-  validation.addValidator("email", {validate: "isTrue", value: /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/,
+  // updated to block Intranet email address user@server1 as it's rarely used nowadays
+  validation.addValidator("email", {validate: "isTrue", value: /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+$/,
              message: "not a valid email"});
 
   // unique. need to access neighbours
diff --git a/test/standard-transformers-and-validators/email.spec.js b/test/standard-transformers-and-validators/email.spec.js
index 4396344..0474321 100644
--- a/test/standard-transformers-and-validators/email.spec.js
+++ b/test/standard-transformers-and-validators/email.spec.js
@@ -12,6 +12,7 @@ test('email: tests email', t => {
   // shortcut
   rule = {a: "email"};
   t.deepEqual(v.validate({a: 'c'}, rule), {a: ["not a valid email"]});
+  t.deepEqual(v.validate({a: 'ab@test'}, rule), {a: ["not a valid email"]});
   t.equal(v.validate({a: 'ab@test.com'}, rule), undefined);
   t.end();
 });