MailerLite

This plugin automatically adds featured images of your posts into the RSS feed.
Features:
<ul>
<li>Automatically adds featured images of your posts into the RSS feed</li>
<li>Choose from all available image sizes</li>
<li>Choose from multiple image alignment options</li>
</ul>

Featured Image in RSS Feed by MailerLite

This plugin automatically adds featured images of your posts into the RSS feed.

thekoder

WordPress Mailerlite Integration Lite integrate your website users with mailerlite email marketing software. 
after any registration in your wordpress site, email of registred user will be added to your selected groups. 
also have a customizable widget that help you to display a newsletter form in your widget areas.

WordPress Mailerlite Integration Lite

With this plugin you can integrate your website users with mailerlite email marketing software

Featured Image in RSS Feed by MailerLite vs WordPress Mailerlite Integration Lite