diff --git a/.well-known/mta-sts.txt b/.well-known/mta-sts.txt
index e3437cf..141c0c2 100644
--- a/.well-known/mta-sts.txt
+++ b/.well-known/mta-sts.txt
@@ -2,5 +2,6 @@ version: STSv1
 mode: enforce
 mx: in1-smtp.messagingengine.com
 mx: in2-smtp.messagingengine.com
+mx: *.mx.cloudflare.net
 max_age: 1209600