diff --git a/app/config.py b/app/config.py
index e6035e5da..0c2fe3361 100644
--- a/app/config.py
+++ b/app/config.py
@@ -76,7 +76,6 @@ class Config(object):
         r"ucds\.email",
         r"naturalengland\.org\.uk",
         r"hmcts\.net",
-        r"irmsecurity\.com",  # temp addition for pen testers to be able to create account
     ]
 
 
diff --git a/tests/app/main/test_validators.py b/tests/app/main/test_validators.py
index f30fe04fa..09c12f3d3 100644
--- a/tests/app/main/test_validators.py
+++ b/tests/app/main/test_validators.py
@@ -82,7 +82,6 @@ def _gen_mock_field(x):
     'test@ucds.email',
     'test@naturalengland.org.uk',
     'test@hmcts.net',
-    'test@irmsecurity.com'  # remove once pen test complete
 ])
 def test_valid_list_of_white_list_email_domains(app_, email):
     with app_.test_request_context():