add mx records to lns names

llarp/handlers/tun.cpp

@@ -407,7 +407,24 @@ namespace llarp
         service::Address addr;
         if (addr.FromString(qname, ".loki") || addr.FromString(qname, ".snode")
             || is_random_snode(msg) || is_localhost_loki(msg))
+        {
           msg.AddMXReply(qname, 1);
+        }
+        else if (service::NameIsValid(lnsName))
+        {
+          return LookupNameAsync(
+              lnsName, [msg = std::make_shared<dns::Message>(msg), lnsName, reply](auto maybe) {
+                if (maybe.has_value())
+                {
+                  msg->AddMXReply(maybe->ToString(), 1);
+                }
+                else
+                {
+                  msg->AddNXReply();
+                }
+                reply(*msg);
+              });
+        }
         else
           msg.AddNXReply();
         reply(msg);