diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index 4a20f6888..7a9bef890 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -617,9 +617,13 @@ def get_service_verify_reply_to_address_partials(service_id, notification_id):
 def service_edit_email_reply_to(service_id, reply_to_email_id):
     form = ServiceReplyToEmailForm()
     reply_to_email_address = current_service.get_email_reply_to_address(reply_to_email_id)
+
     if request.method == 'GET':
         form.email_address.data = reply_to_email_address['email_address']
         form.is_default.data = reply_to_email_address['is_default']
+
+    show_choice_of_default_checkbox = not reply_to_email_address['is_default']
+
     if form.validate_on_submit():
         if form.email_address.data == reply_to_email_address["email_address"] or current_user.platform_admin:
             service_api_client.update_reply_to_email_address(
@@ -653,6 +657,7 @@ def service_edit_email_reply_to(service_id, reply_to_email_id):
         'views/service-settings/email-reply-to/edit.html',
         form=form,
         reply_to_email_address_id=reply_to_email_id,
+        show_choice_of_default_checkbox=show_choice_of_default_checkbox
     )
 
 
diff --git a/app/templates/views/service-settings/email-reply-to/edit.html b/app/templates/views/service-settings/email-reply-to/edit.html
index af59668e0..8f8e86423 100644
--- a/app/templates/views/service-settings/email-reply-to/edit.html
+++ b/app/templates/views/service-settings/email-reply-to/edit.html
@@ -23,7 +23,7 @@
         },
         error_message_with_html=True
     ) }}
-    {% if form.is_default.data %}
+    {% if not show_choice_of_default_checkbox %}
       <p class="form-group">
         This is the default reply-to address for {{ current_service.name }} emails
       </p>
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index 2c3fd9a8c..4b61d0dd6 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -2893,7 +2893,7 @@ def test_add_edit_reply_to_email_address_goes_straight_to_update_if_address_not_
         None,
     ),
 ])
-def test_shows_delete_link_for_email_reply_to_address(
+def test_shows_delete_link_for_get_request_for_edit_email_reply_to_address(
     mocker,
     reply_to_address,
     expected_link_text,
@@ -2923,6 +2923,66 @@ def test_shows_delete_link_for_email_reply_to_address(
         assert not page.select('.page-footer a')
 
 
+@pytest.mark.parametrize('reply_to_address, default_choice_and_delete_link_expected, default_checkbox_checked', [
+    (
+        create_reply_to_email_address(is_default=False),
+        True,
+        False
+    ),
+    (
+        create_reply_to_email_address(is_default=False),
+        True,
+        True
+    ),
+    (
+        create_reply_to_email_address(is_default=True),
+        False,
+        False  # not expecting a checkbox to even be shown to be ticked
+    ),
+])
+def test_shows_delete_link_for_error_on_post_request_for_edit_email_reply_to_address(
+    mocker,
+    reply_to_address,
+    default_choice_and_delete_link_expected,
+    default_checkbox_checked,
+    fake_uuid,
+    client_request,
+):
+    mocker.patch('app.service_api_client.get_reply_to_email_address', return_value=reply_to_address)
+
+    data = {'email_address': "not a valid email address"}
+    if default_checkbox_checked:
+        data["is_default"] = "y"
+
+    page = client_request.post(
+        'main.service_edit_email_reply_to',
+        service_id=SERVICE_ONE_ID,
+        reply_to_email_id=sample_uuid(),
+        _data=data,
+        _expected_status=200
+    )
+
+    assert page.select_one('.govuk-back-link').text.strip() == 'Back'
+    assert page.select_one('.govuk-back-link')['href'] == url_for(
+        '.service_email_reply_to',
+        service_id=SERVICE_ONE_ID,
+    )
+    assert page.select_one('.govuk-error-message').text.strip() == 'Error: Enter a valid email address'
+    assert page.select_one('input#email_address').get('value') == 'not a valid email address'
+
+    if default_choice_and_delete_link_expected:
+        link = page.select_one('.page-footer a')
+        assert normalize_spaces(link.text) == "Delete"
+        assert link['href'] == url_for(
+            'main.service_confirm_delete_email_reply_to',
+            service_id=SERVICE_ONE_ID,
+            reply_to_email_id=sample_uuid()
+        )
+        assert page.select_one('input#is_default').has_attr('checked') == default_checkbox_checked
+    else:
+        assert not page.select('.page-footer a')
+
+
 def test_confirm_delete_reply_to_email_address(
     fake_uuid,
     client_request,