diff --git a/massmail/site/mailingoutadmin.py b/massmail/site/mailingoutadmin.py
index 68f60d9b..c2f6f372 100644
--- a/massmail/site/mailingoutadmin.py
+++ b/massmail/site/mailingoutadmin.py
@@ -63,6 +63,9 @@ class MailingOutAdmin(CrmModelAdmin):
 
     # -- ModelAdmin methods -- #
 
+    def has_add_permission(self, request):
+        return False  # Completely disable adding Mailing Outs
+
     def changelist_view(self, request, extra_context=None):
         extra_context = extra_context or {}
         now = timezone.localtime(timezone.now())
diff --git a/tests/main_menu_data.py b/tests/main_menu_data.py
index 404e0824..10e23ad1 100644
--- a/tests/main_menu_data.py
+++ b/tests/main_menu_data.py
@@ -792,9 +792,9 @@ def get_task_app_data(add_models: tuple = tuple(), prefix: str = '') -> dict:
                     {
                         'name': 'Mailing Outs',
                         'object_name': 'MailingOut',
-                        'perms': get_perms(),
+                        'perms': get_perms(add=False),
                         'admin_url': f'/en/{PREFIX}massmail/mailingout/',
-                        'add_url': f'/en/{PREFIX}massmail/mailingout/add/',
+                        'add_url': None,
                         'view_only': False
                     },
                     {
@@ -1149,9 +1149,9 @@ def get_task_app_data(add_models: tuple = tuple(), prefix: str = '') -> dict:
             {
                 'name': 'Mailing Outs',
                 'object_name': 'MailingOut',
-                'perms': get_perms(),
+                'perms': get_perms(add=False),
                 'admin_url': f'/en/{ADMIN_PREFIX}massmail/mailingout/',
-                'add_url': f'/en/{ADMIN_PREFIX}massmail/mailingout/add/',
+                'add_url': None,
                 'view_only': False
             },
             {