Booter - Bots & Crawlers Manager is a preventative measure (treatment in advance) and treatment of damages caused by crawlers and bots.
The plugin uses a number of existing technologies which are known by crawlers and bots and takes them one step forward - smartly and almost completely automatically.
The Wordpress Plugin WP ImageHost is a simple and easy to configurable plugin to host your images inside your blogposts on a separate subdomain to reduce the number of requests.
Avoids wp_mail to send multiple times the same mail within the same request.
That bug can happens in some times, for example when wp_mail is called with modules that allows PHP code in pages / posts, and when Yoast SEO is activated.