diff --git a/README.md b/README.md
index 0d07722d..20bbdbf1 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ end
 ```ruby
 # bin/outboxer_publisher
 
-Outboxer::Publisher.publish_messages do |messages|
+Outboxer::Publisher.publish_messages do |publisher, messages|
   # TODO: publish messages here
 
   messages.each do |message|
diff --git a/bin/outboxer_publisher b/bin/outboxer_publisher
index 4fcbc9c0..f35013c2 100755
--- a/bin/outboxer_publisher
+++ b/bin/outboxer_publisher
@@ -26,11 +26,11 @@ begin
     sweep_retention: options[:sweep_retention],
     sweep_batch_size: options[:sweep_batch_size],
     logger: logger
-  ) do |messages|
+  ) do |publisher, messages|
     # TODO: publish messages here
 
     messages.each do |message|
-      logger.info "Outboxer published message " \
+      logger.info "Outboxer publisher id=#{publisher[:id]} published message " \
         "id=#{message[:id]} " \
         "messageable_type=#{message[:messageable_type]} " \
         "messageable_id=#{message[:messageable_id]} "
diff --git a/lib/outboxer/publisher.rb b/lib/outboxer/publisher.rb
index 0ea11e87..8f58e22c 100644
--- a/lib/outboxer/publisher.rb
+++ b/lib/outboxer/publisher.rb
@@ -536,7 +536,9 @@ def handle_signal(id:, name:, logger:)
     # @param time [Time] The current time context.
     # @param process [Process] The process module for system metrics.
     # @param kernel [Kernel] The kernel module for sleeping operations.
-    # @yield [Hash] A block to handle the publishing of each message.
+    # @yield [publisher, messages] Yields publisher and messages to be published.
+    # @yieldparam publisher [Hash] A hash with keys `:id` and `:name` representing the publisher.
+    # @yieldparam messages [Array<Hash>] An array of message hashes retrieved from the buffer.
     def publish_messages(
       name: "#{::Socket.gethostname}:#{::Process.pid}",
       buffer_size: PUBLISH_MESSAGES_DEFAULTS[:buffer_size],
@@ -661,7 +663,7 @@ def publish_buffered_messages(id:, name:, buffered_messages:, logger:, &block)
         ids: buffered_message_ids, publisher_id: id, publisher_name: name)
 
       begin
-        block.call(publishing_messages)
+        block.call({ id: id, name: name }, publishing_messages)
       rescue ::Exception => error
         failed_messages = Message.failed_by_ids(
           ids: buffered_message_ids, exception: error, publisher_id: id, publisher_name: name)
diff --git a/spec/bin/outboxer_publisher_spec.rb b/spec/bin/outboxer_publisher_spec.rb
index b27be14e..9be15b20 100644
--- a/spec/bin/outboxer_publisher_spec.rb
+++ b/spec/bin/outboxer_publisher_spec.rb
@@ -27,7 +27,7 @@
         # no output yet
       end
 
-      break if output.include?("Outboxer published message")
+      break if output.match(/published message/)
 
       sleep delay
       warn "Outboxer published message not found. Retrying (attempt #{attempt}/#{max_attempts})..."
@@ -38,8 +38,8 @@
     Process.wait(publisher_pid)
     read_io.close
 
-    expect(output).to include(
-      "Outboxer published message " \
+    expect(output).to match(
+      "published message " \
       "id=#{message[:id]} " \
       "messageable_type=#{message[:messageable_type]} " \
       "messageable_id=#{message[:messageable_id]} "
diff --git a/spec/lib/outboxer/publisher/publish_messages_spec.rb b/spec/lib/outboxer/publisher/publish_messages_spec.rb
index d7139df4..d2ca4394 100644
--- a/spec/lib/outboxer/publisher/publish_messages_spec.rb
+++ b/spec/lib/outboxer/publisher/publish_messages_spec.rb
@@ -29,7 +29,7 @@ module Outboxer
               sweep_batch_size: 100,
               logger: logger,
               kernel: kernel
-            ) do |_messages| # no op
+            ) do |_publisher, _messages| # no op
             end
           end
 
@@ -62,7 +62,7 @@ module Outboxer
               sweep_batch_size: 100,
               logger: logger,
               kernel: kernel
-            ) do |_messages| # no op
+            ) do |_publisher, _messages| # no op
             end
           end
 
@@ -86,7 +86,7 @@ module Outboxer
               sweep_batch_size: 1,
               logger: logger,
               kernel: kernel
-            ) do |_messages| # not called
+            ) do |_publisher, _messages| # no op
             end
           end
 
@@ -115,7 +115,7 @@ module Outboxer
               sweep_batch_size: 100,
               logger: logger,
               kernel: kernel
-            ) do |_messages| # no op
+            ) do |_publisher, _messages| # no op
             end
           end
 
@@ -143,7 +143,7 @@ module Outboxer
               buffer_size: buffer_size,
               poll_interval: poll_interval,
               tick_interval: tick_interval,
-              logger: logger, kernel: kernel) do |_messages|
+              logger: logger, kernel: kernel) do |_publisher, _messages|
               ::Process.kill("TTIN", ::Process.pid)
             end
           end
@@ -169,7 +169,7 @@ module Outboxer
               poll_interval: poll_interval,
               tick_interval: tick_interval,
               logger: logger,
-              kernel: kernel) do |_messages|
+              kernel: kernel) do |_publisher, _messages|
               ::Process.kill("TSTP", ::Process.pid)
             end
           end
@@ -193,7 +193,7 @@ module Outboxer
             poll_interval: poll_interval,
             tick_interval: tick_interval,
             logger: logger,
-            kernel: kernel) do |messages|
+            kernel: kernel) do |_publisher, messages|
             message = messages.first
 
             expect(message[:id]).to eq(queued_message.id)
@@ -220,7 +220,7 @@ module Outboxer
               poll_interval: poll_interval,
               tick_interval: tick_interval,
               logger: logger,
-              kernel: kernel) do |_message|
+              kernel: kernel) do |_publisher, _message|
               ::Process.kill("TERM", ::Process.pid)
 
               raise standard_error
@@ -262,7 +262,7 @@ module Outboxer
               poll_interval: poll_interval,
               tick_interval: tick_interval,
               logger: logger,
-              kernel: kernel) do |_buffer_sizeed_message|
+              kernel: kernel) do |_publisher, _buffer_sized_message|
               raise no_memory_error
             end
           end