diff --git a/app/main/forms.py b/app/main/forms.py
index 0d6761f7d7..72925c5616 100644
--- a/app/main/forms.py
+++ b/app/main/forms.py
@@ -553,7 +553,11 @@ def __init__(self, *args, **kwargs):
 
 
 class SendingDomainForm(StripWhitespaceForm):
-    sending_domain = StringField(_l("Sending domain"), validators=[])
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.sending_domain.choices = kwargs["sending_domain_choices"]
+
+    sending_domain = SelectField(_l("Sending domain"), validators=[])
 
 
 class RenameOrganisationForm(StripWhitespaceForm):
diff --git a/app/main/views/service_settings.py b/app/main/views/service_settings.py
index fd7dd363fe..3d9a09ca5c 100644
--- a/app/main/views/service_settings.py
+++ b/app/main/views/service_settings.py
@@ -72,6 +72,7 @@
     email_safe,
     get_logo_cdn_domain,
     get_new_default_reply_to_address,
+    get_verified_ses_domains,
     user_has_permissions,
     user_is_gov_user,
     user_is_platform_admin,
@@ -549,7 +550,7 @@ def service_set_reply_to_email(service_id):
 @main.route("/services/<service_id>/service-settings/sending-domain", methods=["GET", "POST"])
 @user_is_platform_admin
 def service_sending_domain(service_id):
-    form = SendingDomainForm()
+    form = SendingDomainForm(sending_domain_choices=get_verified_ses_domains())
 
     if request.method == "GET":
         form.sending_domain.data = current_service.sending_domain