For browsers, multiple sites such as caniuse.com have statistics on browser usage, which can help determine compatibility requirements.<p>Does anyone know of similar statistics for email client rendering engines?<p>For that matter, I don&#x27;t see anything in MJML about how to handle plain-text email clients.  (No, &quot;here&#x27;s a link to the HTML on a website&quot; is not OK; the text version should have all the same content as the HTML.)