diff --git a/app/plugins/builtins/__init__.py b/app/plugins/builtins/__init__.py
index 5530404..febf9e3 100644
--- a/app/plugins/builtins/__init__.py
+++ b/app/plugins/builtins/__init__.py
@@ -3,14 +3,15 @@
 Each module in this package that exports a BasePlugin subclass will be
 discovered automatically by the plugin registry on application startup.
 
-Subdirectory plugins (tags, permissions, entity_links) export their plugin
+Subdirectory plugins (tags, permissions, entity_links, mail) export their plugin
 class via __init__.py so the registry can discover them as packages.
 """
 
 from app.plugins.builtins.calendar import CalendarPlugin
 from app.plugins.builtins.dms import DmsPlugin
 from app.plugins.builtins.entity_links import EntityLinksPlugin
+from app.plugins.builtins.mail import MailPlugin
 from app.plugins.builtins.permissions import PermissionsPlugin
 from app.plugins.builtins.tags import TagsPlugin
 
-__all__ = ["TagsPlugin", "PermissionsPlugin", "EntityLinksPlugin", "DmsPlugin", "CalendarPlugin"]
+__all__ = ["TagsPlugin", "PermissionsPlugin", "EntityLinksPlugin", "DmsPlugin", "CalendarPlugin", "MailPlugin"]