diff --git a/src/lib.rs b/src/lib.rs
index e6688ec..8b89e46 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -63,11 +63,8 @@ pub mod extensions {
 }
 
 pub mod message {
-    pub mod ack;
-    pub use ack::MessageAck;
-
     pub mod poll;
-    pub use poll::MessagePoll;
+    pub use poll::{MessagePoll, MessageAck};
 }
 
 pub use client::EppClient;
diff --git a/src/message/poll.rs b/src/message/poll.rs
index 4f3e624..5386f4d 100644
--- a/src/message/poll.rs
+++ b/src/message/poll.rs
@@ -45,18 +45,65 @@ pub enum MessagePollResponse {
     LowBalance(LowBalance),
 }
 
+impl<'a> Transaction<NoExtension> for MessageAck<'a> {}
+
+impl<'a> Command for MessageAck<'a> {
+    type Response = String;
+    const COMMAND: &'static str = "poll";
+}
+
+#[derive(Debug, ToXml)]
+/// Type for EPP XML `<poll>` command for message ack
+#[xml(rename = "poll", ns(EPP_XMLNS))]
+pub struct MessageAck<'a> {
+    /// The type of operation to perform
+    /// The value is "ack" for message acknowledgement
+    #[xml(attribute)]
+    op: &'a str,
+    /// The ID of the message to be acknowledged
+    #[xml(rename = "msgID", attribute)]
+    message_id: &'a str,
+}
+
+impl<'a> MessageAck<'a> {
+    pub fn new(message_id: &'a str) -> Self {
+        Self {
+            op: "ack",
+            message_id,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
-    use super::{MessagePoll, MessagePollResponse};
+    use super::{MessageAck, MessagePoll, MessagePollResponse};
     use crate::host::Status;
     use crate::response::ResultCode;
-    use crate::tests::{assert_serialized, response_from_file, CLTRID, SVTRID};
+    use crate::tests::{assert_serialized, response_from_file, CLTRID, SUCCESS_MSG, SVTRID};
 
     use chrono::{TimeZone, Utc};
     use std::net::IpAddr;
 
     #[test]
-    fn command() {
+    fn ack_command() {
+        let object = MessageAck::new("12345");
+        assert_serialized("request/message/ack.xml", &object);
+    }
+
+    #[test]
+    fn response() {
+        let object = response_from_file::<MessageAck>("response/message/ack.xml");
+        let msg = object.message_queue().unwrap();
+
+        assert_eq!(object.result.code, ResultCode::CommandCompletedSuccessfully);
+        assert_eq!(object.result.message, SUCCESS_MSG);
+        assert_eq!(msg.count, 4);
+        assert_eq!(msg.id, "12345".to_string());
+        assert_eq!(object.tr_ids.server_tr_id, SVTRID);
+    }
+
+    #[test]
+    fn poll_command() {
         let object = MessagePoll::default();
         assert_serialized("request/message/poll.xml", &object);
     }