diff --git a/templates/ingress-autodiscover.yaml b/templates/ingress-autodiscover.yaml
index a808aa46b98a63ac157b0c307ea6883bef6d0938..a5df63c16fab3fb16f4448aed75c0dc2e2414699 100644
--- a/templates/ingress-autodiscover.yaml
+++ b/templates/ingress-autodiscover.yaml
@@ -42,6 +42,16 @@ spec:
                   name: http
             pathType: Prefix
     {{ end }}
+    - host: mta-sts.{{ .Values.config.domain }}
+      http:
+        paths:
+          - path: "/.well-known/mta-sts.txt"
+            backend:
+              service:
+                name: {{ include "mailu-helm.fullname" $ }}-autodiscover
+                port:
+                  name: http
+            pathType: Prefix
     - host: "autodiscover.{{ .Values.config.domain }}"
       http:
         paths: