attributes_default.rb

default['email_handler']['from_address'] = "chef@localhost"
default['email_handler']['to_address'] = "chef@localhost"

base.rb

# BASE ROLE

name "base"
description "Base Server Role"
run_list "recipe[email_handler]", "recipe[chef-client::config]", "recipe[chef-client::delete_validation]", "recipe[chef-client]", "recipe[ntp]", "recipe[motd]", "recipe[users]"
default_attributes({
  "ohai" => { "disabled_plugins" => [ ":Passwd" ] }
})

default.rb

# Cookbook Name:: email_handler
# Recipe:: default
#
# Copyright 2015, YOUR_COMPANY_NAME
#
# All rights reserved - Do Not Redistribute
#

chef_gem "pony" do
  action :install
end

include_recipe "chef_handler"
include_recipe "postfix"
include_recipe "mailx"

cookbook_file "#{node['chef_handler']['handler_path']}/email_handler.rb" do
  source "handlers/email_handler.rb"
  owner "root"
  group "root"
  mode "0644"
end

chef_handler "MyCompany::EmailMe" do
  source "#{node['chef_handler']['handler_path']}/email_handler.rb"
  arguments [ node['email_handler']['from_address'],
              node['email_handler']['to_address'] ]
  action :enable
end

email_handler.rb

require 'rubygems'
require 'pony'

module MyCompany
  class EmailMe < Chef::Handler
    def initialize(from_address, to_address)
      @from_address = from_address
      @to_address = to_address
    end

    def report
      require 'pry' ; binding.pry

      status = "Failed"
      if success?
        status = "Successful"
      end
      subject = "#{status} Chef run report from #{node.name}"

      body = ""

      if ! run_status.updated_resources.empty?
        run_status.updated_resources.each do |r|
          body += "The resource #{r.name} was changed in the cookbook #{r.cookbook_name} at #{r.source_line}\n"
        end
      else
        body += "No resources changed by chef-client\n"
      end

      require 'pry' ; binding.pry

      Pony.mail(:to => @to_address,
                :from => @from_address,
                :subject => subject,
                :body => body)
    end
  end
end

metadata.rb

name             'email_handler'
maintainer       'YOUR_COMPANY_NAME'
maintainer_email 'YOUR_EMAIL'
license          'All rights reserved'
description      'Installs/Configures email_handler'
long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))
version          '0.1.0'

depends "chef_handler"
depends "postfix"
depends "mailx"