modules/mesh-mail-notifier/cmd/mesh-mail-notifier/main.go

@@ -33,7 +33,7 @@ const ShownEvent = "shown"
 func main() {
 	n := &Notifier{
 		Send: func(args map[string]any) error {
-			_, err := stdio.Ask("seat:node-notifier.send", args)
+			_, err := stdio.Ask(sendKey(), args)
 			return err
 		},
 		Accounts: readAccounts,
@@ -67,6 +67,12 @@ func main() {
 	}
 }
 
+// sendKey is the ask key Send uses: this machine's own node-notifier, named exactly as desk-channel asks
+// another machine's ("seat:node-notifier.send@"+machine) and as the SDK's own Emit reads this machine's name
+// (MESH_NODE, which the runtime sets) — not the bare seat, which any machine's node-notifier may answer
+// first, leaving this one's notices undelivered (novox/hq issue 865).
+func sendKey() string { return "seat:node-notifier.send@" + os.Getenv("MESH_NODE") }
+
 // run is main's startup path, factored so a test can run it: the watcher started before stdio.Serve, exactly
 // as mesh-knowledge's serve starts go hear(k) and go background(k) before stdio.Serve — so the watcher keeps
 // running whatever stdio.Serve does with the stream it is given, including returning at once when stdin is

modules/mesh-mail-notifier/cmd/mesh-mail-notifier/send_test.go

@@ -0,0 +1,17 @@
+package main
+
+import "testing"
+
+// TestSendKeyNamesThisMachine proves Send asks its own machine's node-notifier, not the bare seat: a bare
+// "seat:node-notifier.send" is answered by whichever machine's node-notifier takes it first, so notices sent
+// from g14 and shanks were lost to "503 no responders" or another machine's desktop (novox/hq issue 865).
+// desk-channel names the machine it asks the same way ("seat:node-notifier.send@"+machine,
+// modules/desk-channel/cmd/desk-channel/main.go); sendKey must read this machine's own name the same way the
+// SDK's own Emit does, from MESH_NODE, which the runtime sets.
+func TestSendKeyNamesThisMachine(t *testing.T) {
+	t.Setenv("MESH_NODE", "g14")
+
+	if got, want := sendKey(), "seat:node-notifier.send@g14"; got != want {
+		t.Fatalf("sendKey() = %q, want %q (it must name this machine, as desk-channel does)", got, want)
+	}
+}