diff --git a/kustomize/roundcube-deployment.yaml b/kustomize/roundcube-deployment.yaml
index 8645f1e..495026c 100644
--- a/kustomize/roundcube-deployment.yaml
+++ b/kustomize/roundcube-deployment.yaml
@@ -27,6 +27,10 @@ spec:
             value: "25"
           - name: ROUNDCUBEMAIL_DB_TYPE
             value: sqlite
+          - name: ROUNDCUBEMAIL_SMTP_USER
+            value: ""
+          - name: ROUNDCUBEMAIL_SMTP_PASS
+            value: ""
         volumeMounts:
           - name: roundcube-persistent-storage
             mountPath: /var/roundcube