diff --git a/ynr/forms.py b/ynr/forms.py
index cc9b423e38..29f70c2da1 100644
--- a/ynr/forms.py
+++ b/ynr/forms.py
@@ -1,4 +1,5 @@
 from allauth.account.forms import LoginForm, SignupForm
+from django.forms import ValidationError
 
 
 class CustomLoginForm(LoginForm):
@@ -15,3 +16,13 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         for field in ("username", "email", "password1", "password2"):
             del self.fields[field].widget.attrs["placeholder"]
+
+    def clean_email(self):
+        email = self.cleaned_data["email"]
+        prohibited_domains = [".gov", ".ac.uk"]
+        for domain in prohibited_domains:
+            if email.endswith(domain):
+                raise ValidationError(
+                    "Please use a non-government or non-academic email address."
+                )
+        return email
diff --git a/ynr/tests/test_signup.py b/ynr/tests/test_signup.py
new file mode 100644
index 0000000000..2a34754c2d
--- /dev/null
+++ b/ynr/tests/test_signup.py
@@ -0,0 +1,20 @@
+from django_webtest import WebTest
+
+
+class TestSignUpPage(WebTest):
+    def test_invalid_email(self):
+        response = self.app.get("/accounts/signup/")
+
+        self.assertEqual(response.status_code, 200)
+        # submit the form with an prohibited email domain
+        form = response.forms["signup_form"]
+        form["email"] = "john@me.gov"
+        form["password1"] = "password"
+        form["password2"] = "password"
+        response = form.submit()
+        self.assertFormError(
+            response,
+            "form",
+            "email",
+            "Please use a non-government or non-academic email address.",
+        )
diff --git a/ynr/urls.py b/ynr/urls.py
index b0d4e6316f..612d1f2d76 100644
--- a/ynr/urls.py
+++ b/ynr/urls.py
@@ -5,7 +5,6 @@
 from django.contrib.staticfiles.urls import staticfiles_urlpatterns
 from django.views.generic import TemplateView
 
-
 from allauth.account.views import SignupView