diff --git a/conf/mta-sts.txt b/conf/mta-sts.txt
index 376102bc..26acc015 100644
--- a/conf/mta-sts.txt
+++ b/conf/mta-sts.txt
@@ -1,4 +1,4 @@
 version: STSv1
 mode: MODE
 mx: PRIMARY_HOSTNAME
-max_age: 86400
\ No newline at end of file
+max_age: 604800