diff --git a/app/templates/views/send-test.html b/app/templates/views/send-test.html
index 206ad1734..0a39ebdb7 100644
--- a/app/templates/views/send-test.html
+++ b/app/templates/views/send-test.html
@@ -14,7 +14,10 @@
     {{ page_title }}
   </h1>
 
-  {% call form_wrapper(class="js-stick-at-top-when-scrolling", module="autofocus") %}
+  {% call form_wrapper(
+    class="js-stick-at-top-when-scrolling" if template.template_type != 'sms' else '',
+    module="autofocus"
+  ) %}
     <div class="grid-row">
       <div class="column-two-thirds {% if form.placeholder_value.label.text == 'phone number' %}extra-tracking{% endif %}">
         {{ textbox(
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index 77e7ee13f..3d6eb2356 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -1172,6 +1172,33 @@ def test_send_one_off_has_skip_link(
         assert not skip_links
 
 
+@pytest.mark.parametrize('template_mock, expected_sticky', [
+    (mock_get_service_template, False),
+    (mock_get_service_email_template, True),
+    (mock_get_service_letter_template, True),
+])
+def test_send_one_off_has_sticky_header_for_email_and_letter(
+    mocker,
+    client_request,
+    fake_uuid,
+    mock_has_no_jobs,
+    template_mock,
+    expected_sticky,
+):
+    template_mock(mocker)
+    mocker.patch('app.main.views.send.get_page_count_for_letter', return_value=99)
+
+    page = client_request.get(
+        'main.send_one_off_step',
+        service_id=SERVICE_ONE_ID,
+        template_id=fake_uuid,
+        step_index=0,
+        _follow_redirects=True,
+    )
+
+    assert bool(page.select('.js-stick-at-top-when-scrolling')) == expected_sticky
+
+
 @pytest.mark.parametrize('user', (
     active_user_with_permissions,
     active_caseworking_user,