diff --git a/schemas/patch-schema/26-fix-mail.sql b/schemas/patch-schema/26-fix-mail.sql
new file mode 100644
index 000000000..358ab17e6
--- /dev/null
+++ b/schemas/patch-schema/26-fix-mail.sql
@@ -0,0 +1,5 @@
+BEGIN;
+
+ALTER TABLE mail ADD COLUMN IF NOT EXISTS is_sys_message BOOLEAN NOT NULL DEFAULT false;
+
+END;