diff --git a/app/utils/email_domains.txt b/app/utils/email_domains.txt
index f259c826c..a74de1640 100644
--- a/app/utils/email_domains.txt
+++ b/app/utils/email_domains.txt
@@ -8,3 +8,4 @@ ac.uk
 sch.uk
 onevoicewales.wales
 suttonmail.org
+hscni.net