MC4WP: Mailchimp for WordPress的作者是ibericode，目前有1+ 百万个有效安装。已经Tested with 5.4.1版本的wordpress。
MAILCHIMP FOR WORDPRESS
Allowing your visitors to subscribe to your newsletter should be easy. With this plugin, it finally is.
This plugin helps you grow your Mailchimp lists and write better newsletters through various methods. You can create good looking opt-in forms or integrate with any existing form on your site, like your comment, contact or checkout form.
SOME (BUT NOT ALL) FEATURES
Connect with your Mailchimp account in seconds.
Sign-up forms which are good looking, user-friendly and mobile optimized. You have complete control over the form fields and can send anything you like to Mailchimp.
Seamless integration with the following plugins:
Default WordPress Comment Form
Default WordPress Registration Form
Contact Form 7
Ninja Forms 3
Easy Digital Downloads
A multitude of available add-on plugins and integrations:
Mailchimp for WordPress Premium
Mailchimp Top Bar
Well documented. Our knowledge base is updated daily.
Developer friendly. For inspiration, check out our repository of example code snippets.
BECOME A PREMIUM USER
Mailchimp for WordPress has a Premium add-on which comes with several additional benefits.
Advanced e-commerce integration for WooCommerce
An easy way to style your forms
Detailed reports & statistics
View more Premium features
WHAT IS MAILCHIMP?
Mailchimp is a newsletter service that allows you to send out email campaigns to a list of email subscribers. It is free for lists up to 2000 subscribers, which is why it is the newsletter-service of choice for thousands of businesses.
This plugin allows you to tightly integrate your WordPress site with your Mailchimp account.
If you are not yet using Mailchimp, creating an account is 100% free and only takes you about 30 seconds.
Use the WordPress.org plugin forums for community support where we try to help all of our users. If you found a bug, please create an issue on Github where we can act upon them more efficiently.
If you’re a premium user, please use the email address inside the plugin for support as that will guarantee a faster response time.
Please take a look at the Mailchimp for WordPress knowledge base as well.
There are several add-on plugins available, which help you get even more out of your site.
You can help translate Mailchimp for WordPress into your language using your WordPress.org account.
This plugin is being developed on GitHub. If you want to collaborate, please look at ibericode/mailchimp-for-wordpress.
CUSTOMIZING THE PLUGIN
The plugin provides various filter & action hooks that allow you to modify or extend default behavior. We’re also maintaining a collection of sample code snippets.