diff --git a/.well-known/mta-sts.txt b/.well-known/mta-sts.txt
index d8b2cae..e629453 100644
--- a/.well-known/mta-sts.txt
+++ b/.well-known/mta-sts.txt
@@ -1,5 +1,5 @@
 version: STSv1
-mode: testing
+mode: enforce
 mx: mx1.forwardemail.net
 mx: mx2.forwardemail.net
 max_age: 604800