diff --git a/main.tf b/main.tf
index 649ed88..ff48696 100644
--- a/main.tf
+++ b/main.tf
@@ -47,7 +47,7 @@ resource "aws_route53_record" "autodiscover" {
 }
 
 resource "aws_route53_record" "spf" {
-    count   = "${var.enable_exchange ? 1 : 0}"
+    count   = "${var.enable_exchange && length(var.ms_txt) > 0 ? 1 : 0}"
 
     zone_id = "${var.zone_id}"
     name    = ""