120 DPI Issue

Shout out to James White for this DPI Scaling Issues Post.

For Text
Apply width and height attributes to all block level tags like <table> and <td>, then declare a matching CSS width and height property in a style. Do not do this to % based widths.

From this
<table cellpadding="0" cellspacing="0" border="0" width="100%">
  <tr>
    <td width="300" height="120" align="left" valign="top">CONTENT</td>
  </tr>
</table>

To this
<table cellpadding="0" cellspacing="0" border="0" width="100%">
  <tr>
    <td width="300" height="120" align="left" valign="top" style="width:330px; height:120px;">CONTENT</td>
  </tr>
</table>

For Imagery

Replace doctype

From this
<html xmlns="http://www.w3.org/1999/xhtml">

To this
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
Add this before closing </head>

<!--[if gte mso 9]><xml>
 <o:OfficeDocumentSettings>
  <o:AllowPNG></o:AllowPNG>
  <o:PixelsPerInch>96</o:PixelsPerInch>
 </o:OfficeDocumentSettings>
</xml><![endif]-->