diff --git a/rootfs/etc/confd/templates/main.cf.tmpl b/rootfs/etc/confd/templates/main.cf.tmpl
index 9c0cb32..736a413 100644
--- a/rootfs/etc/confd/templates/main.cf.tmpl
+++ b/rootfs/etc/confd/templates/main.cf.tmpl
@@ -61,5 +61,5 @@ message_size_limit = {{getenv "MESSAGE_SIZELIMIT" "20000000"}}
 
 tls_preempt_cipherlist = yes
 
-smtputf8_enable = yes
+smtputf8_enable = no
 biff = no