diff --git a/clusters/cl01tl/applications/roundcube/values.yaml b/clusters/cl01tl/applications/roundcube/values.yaml
index 648905624..55ce9a9ba 100644
--- a/clusters/cl01tl/applications/roundcube/values.yaml
+++ b/clusters/cl01tl/applications/roundcube/values.yaml
@@ -40,7 +40,7 @@ roundcube:
                   name: roundcube-key-secret
                   key: DES_KEY
             - name: ROUNDCUBEMAIL_DEFAULT_HOST
-              value: tls://stalwart.stalwart
+              value: ssl://stalwart.stalwart
             - name: ROUNDCUBEMAIL_DEFAULT_PORT
               value: 993
             - name: ROUNDCUBEMAIL_SMTP_SERVER