How to add WordPress featured image to RSS item

In my Ricard Torres Blog I use the featured image in my theme to show that image at the beginning of each post.

The problem is, that image is not included in the RSS feed because it's not part of the post content. So RSS subscribers or Mailchimp subscribers won't see that image.

It can be solved by adding this straightforward snippet as a plugin or just copying it to your theme's functions.php file.


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