diff --git a/domains/sly.json b/domains/sly.json
index 4730c77da..82ac71bb2 100644
--- a/domains/sly.json
+++ b/domains/sly.json
@@ -10,6 +10,7 @@
         "MX": [
               "mx1.improvmx.com",
               "mx2.improvmx.com"
-        ]
+        ],
+        "TXT": "v=spf1 include:spf.improvmx.com ~all"
     }
-} 
+}