diff --git a/include/amqpcpp.h b/include/amqpcpp.h
index feb9d7a..edfb92d 100644
--- a/include/amqpcpp.h
+++ b/include/amqpcpp.h
@@ -76,7 +76,7 @@
 #include "amqpcpp/deferredrecall.h"
 #include "amqpcpp/channelimpl.h"
 #include "amqpcpp/channel.h"
-#include "amqpcpp/confirmed.h"
+#include "amqpcpp/tagger.h"
 #include "amqpcpp/throttle.h"
 #include "amqpcpp/reliable.h"
 #include "amqpcpp/login.h"
diff --git a/include/amqpcpp/channel.h b/include/amqpcpp/channel.h
index 295c6e4..0bfd2b9 100644
--- a/include/amqpcpp/channel.h
+++ b/include/amqpcpp/channel.h
@@ -604,7 +604,7 @@ public:
     /**
      *  Some internal classes may touch our implementation
      */
-    friend class Confirmed;
+    friend class Tagger;
 };
 
 /**
diff --git a/include/amqpcpp/deferred.h b/include/amqpcpp/deferred.h
index 2e4142c..a5323df 100644
--- a/include/amqpcpp/deferred.h
+++ b/include/amqpcpp/deferred.h
@@ -193,7 +193,7 @@ protected:
      *  private members and construct us
      */
     friend class ChannelImpl;
-    friend class Confirmed;
+    friend class Tagger;
 
 public:
     /**
diff --git a/include/amqpcpp/reliable.h b/include/amqpcpp/reliable.h
index ecd0100..5b4b9e7 100644
--- a/include/amqpcpp/reliable.h
+++ b/include/amqpcpp/reliable.h
@@ -17,7 +17,7 @@
  *  Includes
  */
 #include "deferredpublish.h"
-#include "confirmed.h"
+#include "tagger.h"
 #include <memory>
 
 /**
@@ -28,12 +28,12 @@ namespace AMQP {
 /**
  *  Class definition
  */
-template <typename BASE=Confirmed>
+template <typename BASE=Tagger>
 class Reliable : public BASE
 {
 private:
     // make sure it is a proper channel
-    static_assert(std::is_base_of<AMQP::Confirmed, BASE>::value, "base should be derived from a confirmed channel.");
+    static_assert(std::is_base_of<Tagger, BASE>::value, "base should be derived from a confirmed channel.");
 
     /**
      *  Set of open deliverytags. We want a normal set (not unordered_set) because
@@ -218,10 +218,10 @@ public:
     virtual ~Reliable() = default;
 
     /**
-     *  Method that can be accessed to check if there are still buffered messages.
-     *  @return bool
+     *  Method to check how many messages are still unacked.
+     *  @return size_t
      */
-    virtual bool waiting() const override { return _handlers.size() > 0 || BASE::waiting(); }
+    virtual size_t unacknowledged() const override { return _handlers.size(); }
 
     /**
      *  Publish a message to an exchange. See amqpcpp/channel.h for more details on the flags. 
diff --git a/include/amqpcpp/confirmed.h b/include/amqpcpp/tagger.h
similarity index 88%
rename from include/amqpcpp/confirmed.h
rename to include/amqpcpp/tagger.h
index 974bbef..6ddb733 100644
--- a/include/amqpcpp/confirmed.h
+++ b/include/amqpcpp/tagger.h
@@ -1,5 +1,5 @@
 /**
- *  Confirmed.h
+ *  Tagger.h
  *  
  *  Base class that enables publisher confirms and keeps track of the sent messages.
  *  
@@ -26,7 +26,7 @@ namespace AMQP {
 /**
  *  Class definition
  */
-class Confirmed : public Watchable
+class Tagger : public Watchable
 {
 protected:
     /**
@@ -82,32 +82,32 @@ public:
      *  Constructor
      *  @param  channel
      */
-    Confirmed(AMQP::Channel &channel);
+    Tagger(AMQP::Channel &channel);
 
     /**
      *  Deleted copy constructor, deleted move constructor
      *  @param other
      */
-    Confirmed(const Confirmed &other) = delete;
-    Confirmed(Confirmed &&other) = delete;
+    Tagger(const Tagger &other) = delete;
+    Tagger(Tagger &&other) = delete;
 
     /**
      *  Deleted copy assignment, deleted move assignment
      *  @param  other
      */
-    Confirmed &operator=(const Confirmed &other) = delete;
-    Confirmed &operator=(Confirmed &&other) = delete;
+    Tagger &operator=(const Tagger &other) = delete;
+    Tagger &operator=(Tagger &&other) = delete;
 
     /**
      *  Virtual destructor
      */
-    virtual ~Confirmed() = default;
+    virtual ~Tagger() = default;
 
     /**
-     *  Method to check if there is anything still waiting
-     *  @return bool
+     *  Method to check how many messages are still unacked.
+     *  @return size_t
      */
-    virtual bool waiting() const { return false; }
+    virtual size_t unacknowledged() const { return 0; }
 
     /**
      *  Publish a message to an exchange. See amqpcpp/channel.h for more details on the flags. 
diff --git a/include/amqpcpp/throttle.h b/include/amqpcpp/throttle.h
index e48fe93..80d1b49 100644
--- a/include/amqpcpp/throttle.h
+++ b/include/amqpcpp/throttle.h
@@ -20,7 +20,7 @@
 #include <queue>
 #include "copiedbuffer.h"
 #include "channelimpl.h"
-#include "confirmed.h"
+#include "tagger.h"
 
 /**
  *  Begin of namespaces
@@ -35,7 +35,7 @@ class Channel;
 /**
  *  Class definition
  */
-class Throttle : public Confirmed
+class Throttle : public Tagger
 {
 protected:
     /**
@@ -117,10 +117,10 @@ public:
     virtual ~Throttle() = default;
 
     /**
-     *  Method that can be accessed to check if there are still buffered messages.
-     *  @return bool
+     *  Method to check how many messages are still unacked.
+     *  @return size_t
      */
-    virtual bool waiting() const override { return _queue.size() > 0; }
+    virtual size_t unacknowledged() const override { return _open.size() + (_current - _last - 1); }
 
     /** 
      *  Get the throttle
diff --git a/src/includes.h b/src/includes.h
index 8b139e9..449b5ba 100644
--- a/src/includes.h
+++ b/src/includes.h
@@ -78,7 +78,7 @@
 #include "amqpcpp/channelimpl.h"
 #include "amqpcpp/channel.h"
 #include "amqpcpp/throttle.h"
-#include "amqpcpp/confirmed.h"
+#include "amqpcpp/tagger.h"
 #include "amqpcpp/reliable.h"
 #include "amqpcpp/login.h"
 #include "amqpcpp/address.h"
diff --git a/src/confirmed.cpp b/src/tagger.cpp
similarity index 88%
rename from src/confirmed.cpp
rename to src/tagger.cpp
index 5ace838..00bc637 100644
--- a/src/confirmed.cpp
+++ b/src/tagger.cpp
@@ -1,7 +1,7 @@
 /**
- *  Confirmed.cpp
+ *  Tagger.cpp
  *  
- *  Implementation for Confirmed class.
+ *  Implementation for Tagger class.
  *  
  *  @author Michael van der Werve <michael.vanderwerve@mailerq.com>
  *  @copyright 2020 Copernica BV
@@ -24,7 +24,7 @@ namespace AMQP {
  *  Constructor
  *  @param  channel 
  */
-Confirmed::Confirmed(Channel &channel) : _implementation(channel._implementation)
+Tagger::Tagger(Channel &channel) : _implementation(channel._implementation)
 {
     // activate confirm-select mode
     auto &deferred = channel.confirmSelect()
@@ -43,7 +43,7 @@ Confirmed::Confirmed(Channel &channel) : _implementation(channel._implementation
  *  @param  id
  *  @param  frame
  */
-bool Confirmed::send(uint64_t id, const Frame &frame)
+bool Tagger::send(uint64_t id, const Frame &frame)
 {
     // we're simply going to send it over the channel directly
     return _implementation->send(frame);
@@ -54,10 +54,10 @@ bool Confirmed::send(uint64_t id, const Frame &frame)
  *  @param  deliveryTag
  *  @param  multiple
  */
-void Confirmed::onAck(uint64_t deliveryTag, bool multiple)
+void Tagger::onAck(uint64_t deliveryTag, bool multiple)
 {
     // leap out if there are still messages or we shouldn't close yet
-    if (!_close || waiting()) return;
+    if (!_close || unacknowledged()) return;
 
     // close the channel, and forward the callbacks to the installed handler
     _implementation->close()
@@ -70,10 +70,10 @@ void Confirmed::onAck(uint64_t deliveryTag, bool multiple)
  *  @param  deliveryTag
  *  @param  multiple
  */
-void Confirmed::onNack(uint64_t deliveryTag, bool multiple)
+void Tagger::onNack(uint64_t deliveryTag, bool multiple)
 {
     // leap out if there are still messages or we shouldn't close yet
-    if (!_close || waiting()) return;
+    if (!_close || unacknowledged()) return;
 
     // close the channel, and forward the callbacks to the installed handler
     _implementation->close()
@@ -85,7 +85,7 @@ void Confirmed::onNack(uint64_t deliveryTag, bool multiple)
  *  Method that is called to report an error
  *  @param  message
  */
-void Confirmed::reportError(const char *message)
+void Tagger::reportError(const char *message)
 {
     // reset tracking, since channel is fully broken
     _current = 1;
@@ -106,7 +106,7 @@ void Confirmed::reportError(const char *message)
  *  @param  flags       optional flags
  *  @return uint64_t
  */
-uint64_t Confirmed::publish(const std::string &exchange, const std::string &routingKey, const Envelope &envelope, int flags)
+uint64_t Tagger::publish(const std::string &exchange, const std::string &routingKey, const Envelope &envelope, int flags)
 {
     // @todo do not copy the entire buffer to individual frames
 
@@ -152,7 +152,7 @@ uint64_t Confirmed::publish(const std::string &exchange, const std::string &rout
  *  Close the throttle channel (closes the underlying channel)
  *  @return Deferred&
  */
-Deferred &Confirmed::close()
+Deferred &Tagger::close()
 {
     // if this was already set to be closed, return that
     if (_close) return *_close;
@@ -161,7 +161,7 @@ Deferred &Confirmed::close()
     _close = std::make_shared<Deferred>(_implementation->usable());
 
     // if there are open messages or there is a queue, they will still get acked and we will then forward it
-    if (waiting()) return *_close;
+    if (unacknowledged()) return *_close;
 
     // there are no open messages, we can close the channel directly.
     _implementation->close()
@@ -176,7 +176,7 @@ Deferred &Confirmed::close()
  *  Install an error callback
  *  @param  callback
  */
-void Confirmed::onError(const ErrorCallback &callback)
+void Tagger::onError(const ErrorCallback &callback)
 {
     // we store the callback
     _errorCallback = callback;
diff --git a/src/throttle.cpp b/src/throttle.cpp
index fc87f87..11c82a9 100644
--- a/src/throttle.cpp
+++ b/src/throttle.cpp
@@ -26,7 +26,7 @@ namespace AMQP {
  *  @param  channel 
  *  @param  throttle
  */
-Throttle::Throttle(Channel &channel, size_t throttle) : Confirmed(channel), _throttle(throttle) {}
+Throttle::Throttle(Channel &channel, size_t throttle) : Tagger(channel), _throttle(throttle) {}
 
 /**
  *  Called when the deliverytag(s) are acked
@@ -45,7 +45,7 @@ void Throttle::onAck(uint64_t deliveryTag, bool multiple)
     if (_open.size() < _throttle) flush(_throttle - _open.size());
 
     // call base handler
-    Confirmed::onAck(deliveryTag, multiple);
+    Tagger::onAck(deliveryTag, multiple);
 }
 
 /**
@@ -65,7 +65,7 @@ void Throttle::onNack(uint64_t deliveryTag, bool multiple)
     if (_open.size() < _throttle) flush(_throttle - _open.size());
 
     // call base handler
-    Confirmed::onNack(deliveryTag, multiple);
+    Tagger::onNack(deliveryTag, multiple);
 }
 
 /**
@@ -92,7 +92,7 @@ bool Throttle::send(uint64_t id, const Frame &frame)
     _open.insert(id);
 
     // we can finally actually send it
-    return Confirmed::send(id, frame);
+    return Tagger::send(id, frame);
 }
 
 /**
@@ -111,7 +111,7 @@ void Throttle::reportError(const char *message)
     _last = 0;
 
     // call base method
-    Confirmed::reportError(message);
+    Tagger::reportError(message);
 }
 
 /**