Contact Form 7 plugin allows users to manage multiple forms and customize the contents flexibly with simple markup. It is installed by over 5 million people and is one of the popular WordPress plugins. The form supports Ajax-powered submitting, CAPTCHA, and so on. With the plugin, you can customize the form or mail without any complications. It can easily integrate with an external API. The plugin has features like spam filtering, restricting access to the administration panel, custom layouts, tracking forms submissions with Google Analytics, styling contact form per your preference, redirecting to another URL after submission.