diff --git a/mailu/stack.env b/mailu/stack.env
index 2232038..e1d74c2 100755
--- a/mailu/stack.env
+++ b/mailu/stack.env
@@ -24,8 +24,8 @@ HOSTNAMES=sectorq.eu,mail.sectorq.eu
 POSTMASTER=admin
 
 # Choose how secure connections will behave (value: letsencrypt, cert, notls, mail, mail-letsencrypt)
-#TLS_FLAVOR=cert
-TLS_FLAVOR=letsencrypt
+TLS_FLAVOR=cert
+#TLS_FLAVOR=letsencrypt
 # Authentication rate limit per IP (per /24 on ipv4 and /48 on ipv6)
 AUTH_RATELIMIT_IP=5/hour