diff --git a/mailu3/docker-compose.yml b/mailu3/docker-compose.yml
index a3cc5f1..f95ac0b 100755
--- a/mailu3/docker-compose.yml
+++ b/mailu3/docker-compose.yml
@@ -167,6 +167,10 @@ services:
     networks:
       - default
       - fts_attachments
+    ulimits:
+      nofile:
+        soft: 30000
+        hard: 30000
     restart: ${RESTART:-unless-stopped}
     volumes:
       - /share/docker_data/mailu3/mail:/mail