diff --git a/lib/griddler/mandrill.rb b/lib/griddler/mandrill.rb
index 71c86c0..2bf068a 100644
--- a/lib/griddler/mandrill.rb
+++ b/lib/griddler/mandrill.rb
@@ -1,5 +1,6 @@
 require 'griddler'
 require 'griddler/mandrill/version'
 require 'griddler/mandrill/adapter'
+require 'griddler/mandrill/logging'
 
-Griddler.adapter_registry.register(:mandrill, Griddler::Mandrill::Adapter)
+Griddler.adapter_registry.register(:mandrill, Griddler::Mandrill::Adapter)
\ No newline at end of file
diff --git a/lib/griddler/mandrill/adapter.rb b/lib/griddler/mandrill/adapter.rb
index 4d5cd70..0316e51 100644
--- a/lib/griddler/mandrill/adapter.rb
+++ b/lib/griddler/mandrill/adapter.rb
@@ -12,6 +12,7 @@ def self.normalize_params(params)
       end
 
       def normalize_params
+        logger.debug(message: "entered #normalize_params", events: events)
         events.select do |event|
           event[:spf].present? && (event[:spf][:result] == 'pass' || event[:spf][:result] == 'neutral')
         end.map do |event|
@@ -32,6 +33,12 @@ def normalize_params
         end
       end
 
+      protected
+
+      def logger
+        Logging.logger
+      end
+
       private
 
       attr_reader :params
diff --git a/lib/griddler/mandrill/logging.rb b/lib/griddler/mandrill/logging.rb
new file mode 100644
index 0000000..4a0a6a0
--- /dev/null
+++ b/lib/griddler/mandrill/logging.rb
@@ -0,0 +1,28 @@
+module Griddler
+  module Mandrill
+    module Logging
+      # The default logger discards all message; as we do not want
+      # to start clogging up existing users logs.
+      def self.logger
+        @logger ||= NullLogger.new(STDOUT)
+      end
+
+      # Set your application's logger
+      # @example In a Rails initializer:
+      #    Griddler::Mandrill::Logging.logger = Rails.logger
+      # @example In Rails while logging a different level than the default logger
+      #    Griddler::Mandrill::Logging.logger = ActiveSupport::Logger.new(Rails.logger, level: :debug)
+      def self.logger=(logger)
+        @logger = logger
+      end
+
+      # A logger which discards messages
+      class NullLogger < Logger
+        # Overload the Logger#add method as this is where the #info/#warn/#error methods
+        # send their messags to the logging subsystem.
+        def add(*_arguments)
+        end
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/spec/fixtures/photo1.jpg b/spec/fixtures/photo1.jpg
new file mode 100644
index 0000000..3d55486
Binary files /dev/null and b/spec/fixtures/photo1.jpg differ
diff --git a/spec/fixtures/photo2.jpg b/spec/fixtures/photo2.jpg
new file mode 100644
index 0000000..852d3bd
Binary files /dev/null and b/spec/fixtures/photo2.jpg differ
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2053537..adcefb9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,4 @@
+require 'griddler'
 require 'griddler/testing'
 require 'griddler/mandrill'
 require 'action_dispatch'
@@ -10,6 +11,13 @@
   config.include Griddler::Testing
 end
 
+
+class Griddler::Testing::UploadedImage
+  def fixture_file
+    cwd = File.expand_path File.dirname(__FILE__)
+    File.new(File.join(cwd, 'fixtures', @name))
+  end
+end
 RSpec::Matchers.define :be_normalized_to do |expected|
   failure_message do |actual|
     message = ""