diff --git a/app/email_domains.txt b/app/email_domains.txt
new file mode 100644
index 000000000..9307121ec
--- /dev/null
+++ b/app/email_domains.txt
@@ -0,0 +1,20 @@
+gov.uk
+mod.uk
+mil.uk
+ddc-mod.org
+gov.scot
+parliament.scot
+parliament.uk
+nhs.uk
+nhs.net
+police.uk
+scotent.co.uk
+assembly.wales
+cjsm.net
+gov.wales
+ac.uk
+sch.uk
+onevoicewales.wales
+mtvh.co.uk
+wmca.org.uk
+suttonmail.org
diff --git a/app/email_domains.yml b/app/email_domains.yml
deleted file mode 100644
index 4bb9c6cb7..000000000
--- a/app/email_domains.yml
+++ /dev/null
@@ -1,21 +0,0 @@
----
-- gov.uk
-- mod.uk
-- mil.uk
-- ddc-mod.org
-- gov.scot
-- parliament.scot
-- parliament.uk
-- nhs.uk
-- nhs.net
-- police.uk
-- scotent.co.uk
-- assembly.wales
-- cjsm.net
-- gov.wales
-- ac.uk
-- sch.uk
-- onevoicewales.wales
-- mtvh.co.uk
-- wmca.org.uk
-- suttonmail.org
diff --git a/app/utils.py b/app/utils.py
index dc4c9b3ba..cf4c93ee1 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -13,7 +13,6 @@ import ago
 import dateutil
 import pyexcel
 import pyexcel_xlsx
-import yaml
 from flask import abort, current_app, redirect, request, session, url_for
 from flask_login import current_user
 from notifications_utils.field import Field
@@ -39,10 +38,10 @@ FAILURE_STATUSES = ['failed', 'temporary-failure', 'permanent-failure',
                     'technical-failure', 'virus-scan-failed', 'validation-failed']
 REQUESTED_STATUSES = SENDING_STATUSES + DELIVERED_STATUSES + FAILURE_STATUSES
 
-with open('{}/email_domains.yml'.format(
+with open('{}/email_domains.txt'.format(
     os.path.dirname(os.path.realpath(__file__))
 )) as email_domains:
-    GOVERNMENT_EMAIL_DOMAIN_NAMES = yaml.safe_load(email_domains)
+    GOVERNMENT_EMAIL_DOMAIN_NAMES = [line.strip() for line in email_domains]
 
 
 def user_has_permissions(*permissions, **permission_kwargs):
diff --git a/requirements.txt b/requirements.txt
index ac4ab01ee..73f474fec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -61,7 +61,6 @@ PyJWT==1.7.1
 PyPDF2==1.26.0
 python-dateutil==2.8.0
 python-json-logger==0.1.10
-PyYAML==3.13
 redis==3.2.1
 requests==2.22.0
 rsa==3.4.2