diff --git a/main.go b/main.go
index aa58329..d5fb39c 100644
--- a/main.go
+++ b/main.go
@@ -437,6 +437,8 @@ func handleMessageRoutes(w http.ResponseWriter, r *http.Request) {
 		handleToDocs(w, r, messageID)
 	case "attachments":
 		handleAttachments(w, r, messageID)
+	case "seen":
+		handleSeen(w, r, messageID)
 	default:
 		http.Error(w, "Unknown action", http.StatusNotFound)
 	}
@@ -474,6 +476,19 @@ func handleArchive(w http.ResponseWriter, r *http.Request, id string) {
 	json.NewEncoder(w).Encode(map[string]string{"status": "archived"})
 }
 
+// POST /messages/{id}/seen - mark as seen without archiving/deleting
+// Removes from /messages/new but keeps message in its original mailbox
+func handleSeen(w http.ResponseWriter, r *http.Request, id string) {
+	if r.Method != "POST" {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	orch.RecordAction(id, "seen")
+
+	json.NewEncoder(w).Encode(map[string]string{"status": "seen"})
+}
+
 func handleDelete(w http.ResponseWriter, r *http.Request, id string) {
 	if r.Method != "POST" {
 		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)