Wordpress Backdoor Search with Ansible

wordpress-backdoor.yml

- hosts: www_servers
  user: ubuntu
  sudo: yes
  vars:
    folder: /usr/share/nginx/html
    backdoor_keywords:
      - "FilesMan"                 # OK
      - "<?php \\${"               # OK
      - 'mail(stripslashes('       # OK
      - "<?php \\$array = array("  # OK
      - "<?php @array_diff_ukey("  # OK
      - "\\$_REQUEST\\[chr("
      - "; \\$GLOBALS"             # OK
      - '\"base64_decode\";return' # OK
      - "<?php \\$GLOBALS"  
      - "eval(\\${"                # OK
      - "isset(\\${"               # OK
      - "PhpReverseProxy"          # OK
      - "str_rot13("               # OK
      - "@assert("                 # OK
      - "made-in-china.com"        # OK
      - "@eval($"                  # OK
      - "trim(curl_exec(\\$ch))"   # OK
      - "eval(stripslashes(\\$"    # OK

  tasks:
    - name: #
      shell: grep -rnw {{folder}} -e "{{item}}" | cut -d":" -f1
      register: backdoor_files
      with_items: backdoor_keywords

    - debug: msg="{{item.stdout.split('\n')}}"
      with_items: backdoor_files.results
      when: item.stdout

Hello, How can I add an email notification code in my theme or plugin... If I have a theme or plugin for everyone. I want to add some code to make a backdoor with email notification. If anybody installs my theme on her website I will get an email notification with her website name/URL. If you have those code kindly help me... I need to learn it also, Thank you