BogdanFix

This plugin lets you capture emails from your WP comment form, WP registration form, WooCommerce checkout form, pages built with Gutenberg and Divi Builder.
You can: 
* add subscribe checkbox to any of these forms 
* make it pre-checked 
* make subscription implicit (hidden checkbox)
Also you can easily export your WordPress users and/or WooCommerce customers to one of your lists in just 3 clicks, literally.
All you need to start using this plugin is your SendFox API key (aka “Personal Access Token”).
SendFox website, title and logo are owned by <a href="https://sumo.com/?utm_source=sf4wp&utm_medium=web&utm_campaign=wpplugindesc" rel="nofollow ugc">Sumo Group, Inc.</a>

WP SendFox

Capture emails and add them to your SendFox list via comments, registration, WooCommerce checkout, Gutenberg page or Divi Builder page.

Akshar Soft Solutions

Plugin allow you to integrate your Zippy Course Plugin with SendFox optin
Usage
Basic usage
Once you have installed and activated the plugin, navigate to Zippy Course, Settings, Email Lists. You will find Sendfox in list. 
Enable sendfox and enter your access token and save changes. After that you will see SendFox in relevant all Courses and Product pages.
IMPORTANT NOTES
This plugin sends data to SendFox. You can find more details at https://sendfox.com/. Plugin is using API mentioned at https://sendfox.helpscoutdocs.com/article/135-endpoints
<h3>Requirements</h3>
<ul>
<li>PHP 5.3 or higher</li>
</ul>
<h3>Translations</h3>
<ul>
<li>None</li>
</ul>

AS Sendfox Opt-In Integration with Zippy Courses

Integrate SendFox Optin with your Zippy Course Plugin

WP SendFox vs AS Sendfox Opt-In Integration with Zippy Courses