JSFiddle - React, Tailwind, and code Playground

HTML

<table id="table">
    <tr>
        <td><a href="mailto:[email protected]">[email protected]</a></td>
    </tr>
    
</table>

JavaScript

(function(allLinks)
{
    var i, imgHTML = '<img src="mail.png" alt="mail" />foo';
    for (i = 0; i < allLinks.length; i++)
    {
        if (allLinks[i].getAttribute('href').indexOf('mailto') > -1)
        {
            allLinks[i].innerHTML += imgHTML;
        }
    }
}(document.getElementsByTagName('a')));