Add send.trix configuration for domain settings

domains/send.trix

@@ -0,0 +1,10 @@
+{
+    "owner": {
+        "username": "tr1xem",
+        "email": "admin@trix.is-a.dev"
+    },
+    "records": {
+        "MX": ["feedback-smtp.ap-northeast-1.amazonses.com"],
+        "TXT": ["v=spf1 include:amazonses.com ~all"]
+    }
+}