MB MB

This plugin makes it easy to display the featured images of your posts in mailchimp RSS newsletters.
Once activated this plugin will add the following to your sites default rss feed:
To the rss name space declarations:
<pre><code> xmlns:media="http://search.yahoo.com/mrss/"
</code></pre>
To each individual item (if it has a featured image):
<pre><code><media:content url="[url]" type="[mimetype]" medium="image" width="100%" height="auto">
 <media:description type="plain"><![CDATA[title]]></media:description>
</media:content>
</code></pre>
The featured images are not inserted directly into the content of your posts, so you have full control over where and how to present them. 
If you send out newsletters using a Mailchimp RSS based Campaign, simply place the *|RSSITEM:IMAGE|* merge-tag in your mail template where you want the featured image inserted.
This plugin contains
<ul>
<li>100% clean lightweight code.</li>
<li>0% JS</li>
<li>0% CSS</li>
<li>0% options</li>
</ul>
The plugin uses the hooks ‘rss2_ns’ and ‘rss2_item’, part of the WordPress core API. 
Tested with WP 3.7.1 and MailChimp Dec 2013
Contribute via <a href="https://github.com/mikkelbreum/MB-ImageChimp-RSS-Feed-Enhancer/" title="MB-ImageChimp-RSS-Feed-Enhancer" rel="nofollow ugc">github</a>

MB ImageChimp RSS Feed Enhancer

Adds featured images to the default RSS feed for use with MailChimps image merge-tag

Ethan Allen

A simple and easy way to add featured images in your site’s RSS feed with customizable sizing options.
Adds featured images to Mailchimp emails, Infusionsoft, Hubspot, Constant Contact, Zoho, Feedburner, Bloglovin’, Feedly, and other services that use RSS feed data.
Works great with Mailchimp’s RSS-to-Email campaigns, allowing you to be more creative and get the most value from your email newsletters. You can even set the xml encoding of your RSS feed. (the default setting is UTF-8).
For more information on setting up and using RSS with Images, view the documentation <a href="https://endif.media/userdocs/setting-up-and-using-rss-with-images/" rel="nofollow ugc">here</a>.
note: RSS with Images will not add already existing images to your feed. Once the plugin is activated, any new image added to a post will be included in the feed.
<a href="https://wordpress.org/support/view/plugin-reviews/rss-with-images?filter=5#postform" rel="ugc">Rate this plugin</a>, I would LOVE the feedback!
ENJOY!

RSS with Images

Had to leave my first ever rating for a Wordpress plugin because I felt the current 3/5 star rating was extremely unfair. I've used this plugin on a production site for over a year (to integrate with Mailchimp RSS campaigns) and it's worked flawlessly.



Does what it says on the tin

Seamlessly adds featured images to your RSS feed with customizable sizing options.

MB ImageChimp RSS Feed Enhancer vs RSS with Images