diff --git a/roundcube/docker-compose.yml b/roundcube/docker-compose.yml
index 8adee13..02eea38 100644
--- a/roundcube/docker-compose.yml
+++ b/roundcube/docker-compose.yml
@@ -13,8 +13,10 @@ services:
     env_file: secrets/app.secrets
     environment:
       - ROUNDCUBEMAIL_SKIN=elastic
-      - ROUNDCUBEMAIL_DEFAULT_HOST=tls://${MAIL_SERVER}
-      - ROUNDCUBEMAIL_SMTP_SERVER=tls://${MAIL_SERVER}
+      - ROUNDCUBEMAIL_DEFAULT_HOST=ssl://${MAIL_SERVER}
+      - ROUNDCUBEMAIL_SMTP_SERVER=ssl://${MAIL_SERVER}
+      - ROUNDCUBEMAIL_SMTP_PORT=465
+      - ROUNDCUBEMAIL_DEFAULT_PORT=993
       - ROUNDCUBEMAIL_PLUGINS=archive, zipdownload, enigma, carddav
     networks:
       - default