diff --git a/helmfile/apps/open-xchange/values-postfix.yaml.gotmpl b/helmfile/apps/open-xchange/values-postfix.yaml.gotmpl
index 16b4c76f..8fcbe508 100644
--- a/helmfile/apps/open-xchange/values-postfix.yaml.gotmpl
+++ b/helmfile/apps/open-xchange/values-postfix.yaml.gotmpl
@@ -64,6 +64,8 @@ postfix:
       password:
         value: {{ .Values.smtp.password }}
   smtpSASLAuthEnable: "yes"
+  {{- else }}
+  smtpSASLAuthEnable: "no"
   {{- end }}
   allowRelayNets: false
   smtpTLSSecurityLevel: "encrypt"
diff --git a/helmfile/apps/services-external/values-postfix.yaml.gotmpl b/helmfile/apps/services-external/values-postfix.yaml.gotmpl
index 430d3187..c22c28fb 100644
--- a/helmfile/apps/services-external/values-postfix.yaml.gotmpl
+++ b/helmfile/apps/services-external/values-postfix.yaml.gotmpl
@@ -72,6 +72,8 @@ postfix:
       password:
         value: {{ .Values.smtp.password }}
   smtpSASLAuthEnable: "yes"
+  {{- else }}
+  smtpSASLAuthEnable: "no"
   {{- end }}
   # Warning: This setting allows unauthenticated mail relay from relayNets!
   allowRelayNets: true