diff --git a/cmd/unread/unread.go b/cmd/unread/unread.go
index 1f2548c..87022e4 100644
--- a/cmd/unread/unread.go
+++ b/cmd/unread/unread.go
@@ -95,11 +95,33 @@ func newMailCounter() *mailCounter {
 func (mc *mailCounter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("Content-Type", "application/json")
-	c := map[string]int{}
-	for k, v := range mc.counts {
-		if v != 0 {
-			c[k] = v
+	var c interface{}
+	if q := r.URL.Query(); q.Get("format") == "list" {
+		type box struct {
+			Name  string `json:"name"`
+			Count int    `json:"count"`
 		}
+		boxes := []box{}
+		names := []string{}
+		for name := range mc.counts {
+			names = append(names, name)
+		}
+		sort.Strings(names)
+		for _, k := range names {
+			v := mc.counts[k]
+			if v != 0 {
+				boxes = append(boxes, box{Name: k, Count: v})
+			}
+		}
+		c = boxes
+	} else {
+		m := map[string]int{}
+		for k, v := range mc.counts {
+			if v != 0 {
+				m[k] = v
+			}
+		}
+		c = m
 	}
 	enc := json.NewEncoder(w)
 	err := enc.Encode(c)