diff --git a/domains/_dmarc.sienna-oshea.json b/domains/_dmarc.sienna-oshea.json
new file mode 100644
index 0000000000..7ce5b31c21
--- /dev/null
+++ b/domains/_dmarc.sienna-oshea.json
@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "osheasienna",
+    "email": "osheasienna@gmail.com"
+  },
+  "records": {
+    "TXT": "v=DMARC1; p=none;"
+  }
+}