Edit in JSFiddle


              
<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

  </head>

  <body>
    <table border="0" cellpadding="0" cellspacing="0" width="600" id="templateColumns">
      <tr>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="leftColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="leftColumnContent">
                <h1>Left Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
      </tr>


      <tr>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="leftColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="leftColumnContent">
                <h1>Left Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
      </tr>



      <tr>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="leftColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="leftColumnContent">
                <h1>Left Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
        <td align="center" valign="top" width="50%" class="templateColumnContainer">
          <table border="0" cellpadding="10" cellspacing="0" width="100%">
            <tr>
              <td class="rightColumnContent">
                <img src="http://placekitten.com/g/480/300" width="280" style="max-width:280px;" class="columnImage" />
              </td>
            </tr>
            <tr>
              <td valign="top" class="rightColumnContent">
                <h1>Right Column</h1>
                Lorem ipsum dolor sit amet.
              </td>
            </tr>
          </table>
        </td>
      </tr>
    </table>
  </body>

</html>
 @media only screen and (max-width: 480px) {
   #templateColumns {
     width: 100% !important;
   }
   .templateColumnContainer {
     display: block !important;
     width: 100% !important;
   }
   .columnImage {
     height: auto !important;
     max-width: 480px !important;
     width: 100% !important;
   }
   .leftColumnContent {
     font-size: 16px !important;
     line-height: 125% !important;
   }
   .rightColumnContent {
     font-size: 16px !important;
     line-height: 125% !important;
   }
 }