diff --git a/app/main/views/send.py b/app/main/views/send.py
index 8307637c9..5c8555970 100644
--- a/app/main/views/send.py
+++ b/app/main/views/send.py
@@ -323,7 +323,8 @@ def send_test_step(service_id, template_id, step_index):
             template_id=template_id,
             filetype='png',
         ),
-        page_count=session['send_test_letter_page_count']
+        page_count=session['send_test_letter_page_count'],
+        email_reply_to=get_email_reply_to_address_from_session(service_id),
     )
 
     placeholders = fields_to_fill_in(
@@ -448,7 +449,6 @@ def _check_messages(service_id, template_type, upload_id, letters_as_pdf=False):
     remaining_messages = (current_service['message_limit'] - sum(stat['requested'] for stat in statistics.values()))
 
     contents = s3download(service_id, upload_id)
-
     template = get_template(
         service_api_client.get_service_template(
             service_id,
@@ -462,7 +462,8 @@ def _check_messages(service_id, template_type, upload_id, letters_as_pdf=False):
             template_type=template_type,
             upload_id=upload_id,
             filetype='png',
-        ) if not letters_as_pdf else None
+        ) if not letters_as_pdf else None,
+        email_reply_to=get_email_reply_to_address_from_session(service_id),
     )
     recipients = RecipientCSV(
         contents,
@@ -726,7 +727,8 @@ def _check_notification(service_id, template_id, exception=None):
     template = get_template(
         db_template,
         current_service,
-        show_recipient=True
+        show_recipient=True,
+        email_reply_to=get_email_reply_to_address_from_session(service_id),
     )
 
     # go back to start of process
@@ -805,3 +807,10 @@ def send_notification(service_id, template_id):
         notification_id=noti['id'],
         help=request.args.get('help')
     ))
+
+
+def get_email_reply_to_address_from_session(service_id):
+    if session.get('sender_id'):
+        return service_api_client.get_reply_to_email_address(
+            service_id, session['sender_id']
+        )['email_address']
diff --git a/app/utils.py b/app/utils.py
index 16f759aeb..d21d5e643 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -272,6 +272,7 @@ def get_template(
     letter_preview_url=None,
     page_count=1,
     redact_missing_personalisation=False,
+    email_reply_to=None,
 ):
     if 'email' == template['template_type']:
         return EmailPreviewTemplate(
@@ -281,6 +282,7 @@ def get_template(
             expanded=expand_emails,
             show_recipient=show_recipient,
             redact_missing_personalisation=redact_missing_personalisation,
+            reply_to=email_reply_to,
         )
     if 'sms' == template['template_type']:
         return SMSPreviewTemplate(
diff --git a/requirements.txt b/requirements.txt
index b0f20d81c..232b584b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,4 +22,4 @@ notifications-python-client==4.4.0
 awscli>=1.11,<1.12
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@21.2.0#egg=notifications-utils==21.2.0
+git+https://github.com/alphagov/notifications-utils.git@21.5.0#egg=notifications-utils==21.5.0
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index f91473141..2dfe09243 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -16,6 +16,7 @@ from notifications_utils.recipients import RecipientCSV
 
 from tests import validate_route_permission, validate_route_permission_with_client
 from tests.conftest import (
+    fake_uuid,
     mock_get_service_template,
     mock_get_service_template_with_placeholders,
     mock_get_service_letter_template,
@@ -2233,3 +2234,54 @@ def test_send_notification_shows_email_error_in_trial_mode(
     assert normalize_spaces(page.select('.banner-dangerous p')[0].text) == (
         'In trial mode you can only send to yourself and members of your team'
     )
+
+
+@pytest.mark.parametrize('endpoint, extra_args', [
+    ('main.check_messages', {'template_type': 'email', 'upload_id': fake_uuid()}),
+    ('main.send_one_off_step', {'template_id': fake_uuid(), 'step_index': 0}),
+])
+@pytest.mark.parametrize('reply_to_address', [
+    None,
+    fake_uuid(),
+])
+def test_reply_to_is_previewed_if_chosen(
+    client_request,
+    mocker,
+    mock_get_service_email_template,
+    mock_s3_download,
+    mock_get_users_by_service,
+    mock_get_detailed_service_for_today,
+    get_default_reply_to_email_address,
+    endpoint,
+    extra_args,
+    reply_to_address,
+):
+
+    mocker.patch('app.main.views.send.s3download', return_value="""
+        email_address,date,thing
+        notify@digital.cabinet-office.gov.uk,foo,bar
+    """)
+
+    with client_request.session_transaction() as session:
+        session['recipient'] = 'notify@digital.cabinet-office.gov.uk'
+        session['placeholders'] = {}
+        session['upload_data'] = {
+            'original_file_name': 'example.csv',
+            'template_id': fake_uuid(),
+            'notification_count': 1,
+            'valid': True
+        }
+        session['sender_id'] = reply_to_address
+
+    page = client_request.get(
+        endpoint,
+        service_id=SERVICE_ONE_ID,
+        **extra_args
+    )
+
+    email_meta = page.select_one('.email-message-meta').text
+
+    if reply_to_address:
+        assert 'test@example.com' in email_meta
+    else:
+        assert 'test@example.com' not in email_meta