diff --git a/README.md b/README.md
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@@ -266,6 +266,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 
 *Libraries that implement email creation and sending*
 
+* [douceur](https://github.com/aymerick/douceur) - CSS inliner for your HTML emails.
 * [email](https://github.com/jordan-wright/email) - A robust and flexible email library for Go.
 * [go-dkim](https://github.com/toorop/go-dkim) - A DKIM library, to sign & verify email.
 * [Gomail](https://github.com/go-gomail/gomail/) - Gomail is a very simple and powerful package to send emails.