diff --git a/actions.go b/actions.go
index e535d71..6b545c0 100644
--- a/actions.go
+++ b/actions.go
@@ -5,4 +5,5 @@ type Action int
 const (
 	UnknownAction Action = iota - 1
 	TextAction
+	DeliveryAction
 )
diff --git a/cmd/bot/main.go b/cmd/bot/main.go
index fec281d..f1edd0a 100644
--- a/cmd/bot/main.go
+++ b/cmd/bot/main.go
@@ -34,6 +34,10 @@ func main() {
 		fmt.Println(r.Text("Hello, World!"))
 	})
 
+	m.Handle(messenger.DeliveryAction, func(m messenger.Message, r *messenger.Response) {
+		fmt.Println(m.Delivery.Watermark.Format(time.UnixDate))
+	})
+
 	fmt.Println("Serving messenger bot on localhost:8080")
 
 	http.ListenAndServe("localhost:8080", m.Handler())
diff --git a/message.go b/message.go
index 28228fb..bc43581 100644
--- a/message.go
+++ b/message.go
@@ -3,8 +3,16 @@ package messenger
 import "time"
 
 type Message struct {
-	Sender    int64
-	Recipient int64
+	Sender    Sender
+	Recipient Recipient
 	Time      time.Time
 	Text      string
+	Seq       int
+	Delivery  *Delivery
+}
+
+type Delivery struct {
+	Mids      []string
+	Watermark time.Time
+	Seq       int
 }
diff --git a/messenger.go b/messenger.go
index 1cd4e47..71d5956 100644
--- a/messenger.go
+++ b/messenger.go
@@ -80,10 +80,20 @@ func (m *Messenger) dispatch(r Receive) {
 
 			if f := m.handlers[a]; f != nil {
 				message := Message{
-					Sender:    info.Sender.ID,
-					Recipient: info.Recipient.ID,
+					Sender:    info.Sender,
+					Recipient: info.Recipient,
 					Time:      time.Unix(info.Timestamp, 0),
-					Text:      info.Message.Text,
+				}
+
+				switch a {
+				case TextAction:
+					message.Text = info.Message.Text
+				case DeliveryAction:
+					message.Delivery = &Delivery{
+						Mids:      info.Delivery.Mids,
+						Seq:       info.Delivery.Seq,
+						Watermark: time.Unix(info.Delivery.Watermark, 0),
+					}
 				}
 
 				response := &Response{
@@ -100,6 +110,8 @@ func (m *Messenger) dispatch(r Receive) {
 func (m *Messenger) classify(info MessageInfo, e Entry) Action {
 	if info.Message != nil {
 		return TextAction
+	} else if info.Delivery != nil {
+		return DeliveryAction
 	}
 
 	return UnknownAction
diff --git a/receiving.go b/receiving.go
index 2548488..8a87514 100644
--- a/receiving.go
+++ b/receiving.go
@@ -12,10 +12,11 @@ type Entry struct {
 }
 
 type MessageInfo struct {
-	Sender    Sender           `json:"sender"`
-	Recipient Recipient        `json:"recipient"`
-	Timestamp int64            `json:"timestamp"`
-	Message   *MessageCallback `json:"message"`
+	Sender    Sender            `json:"sender"`
+	Recipient Recipient         `json:"recipient"`
+	Timestamp int64             `json:"timestamp"`
+	Message   *MessageCallback  `json:"message"`
+	Delivery  *DeliveryCallback `json:"delivery"`
 }
 
 type Sender struct {
@@ -31,3 +32,9 @@ type MessageCallback struct {
 	Seq  int    `json:"seq"`
 	Text string `json:"text"`
 }
+
+type DeliveryCallback struct {
+	Mids      []string `json:"mids"`
+	Watermark int64    `json:"watermark"`
+	Seq       int      `json:"seq"`
+}