I have a letter that works fine in all email clients (Outlook, iOS, Litmus, etc.), except for the Gmail application on Android.
In this application, spaces appear in it. This is a screenshot of the problem, this is just a basic proof of concept:

Below is the HTML code, the problem occurs with nested tables in table cells (td). Thus, it has a set of tables and cells with images inside that have the same size of their cell.
Here is the jsfiddle html: http://jsfiddle.net/cntdsp5p/
And here is the html:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html style="margin-top: 0px !important; padding-top: 0px !important">
<head>
<style type="text/css">
html, body{ margin-top: 0px !important; padding-top: 0px !important; }
body{ background-color:#FFFFFF; margin-top: 0px !important; padding-top: 0px !important; font-family:sans-serif; }
table{ margin-top: 0px !important; padding-top: 0px !important; }
a img{ color:#000001 !important; }
.wysiwyg-text-align-right{ text-align: right; }
.wysiwyg-text-align-center { text-align: center; }
.wysiwyg-text-align-left{ text-align: left; }
.wysiwyg-text-align-justify{ text-align: justify; }
body{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#000000 !important; font-family:Arial; font-size:14px; line-height:24px; }
h1{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#000000 !important; font-weight:400; font-family:Arial; font-size:36px; line-height:44px; }
h2{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#000000 !important; font-weight:400; font-family:Arial; font-size:24px; line-height:32px; }
h3{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#000000 !important; font-weight:400; font-family:Arial; font-size:15px; line-height:21px; }
p{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#000000 !important; font-family:Arial; font-size:14px; line-height:24px; }
a{ text-shadow:none; padding-top:0; padding-right:0; padding-bottom:0; padding-left:0; margin-top:0; margin-right:0; margin-bottom:0; margin-left:0; color:#1122CC !important; text-decoration:underline; }
.mi-all{ display: block; }
.mi-desktop{ display: block; }
.mi-mobile{
display: none;
font-size: 0;
max-height: 0;
line-height: 0;
padding: 0;
float: left;
overflow: hidden;
mso-hide: all;
}
</style>
<style type="text/css" >
@media only screen and (max-device-width: 480px), screen and (max-width: 480px), screen and (orientation: landscape) and (max-width: 630px) {
.mi-desktop{ display: none !important; }
.mi-mobile{
display: block !important;
font-size: 12px !important;
max-height: none !important;
line-height: 1.5 !important;
float: none !important;
overflow: visible !important;
}
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body style="background: #FFFFFF; color: #000000 !important; font-family: Arial; font-size: 14px; line-height: 24px; margin: 0px 0 0 0px; padding: 0px 0 0; text-shadow: none" bgcolor="#FFFFFF">
<style type="text/css">
body {
margin-top: 0px !important; padding-top: 0px !important;
}
body {
background-color: #FFFFFF; margin-top: 0px !important; padding-top: 0px !important; font-family: sans-serif;
}
body {
text-shadow: none; padding-top: 0; padding-right: 0; padding-bottom: 0; padding-left: 0; margin-top: 0; margin-right: 0; margin-bottom: 0; margin-left: 0; color: #000000 !important; font-family: Arial; font-size: 14px; line-height: 24px;
}
</style>
<div class="mi-desktop" style="display: block">
<table width="100%" cellspacing="0" cellpadding="0" align="center" style="background: #FFFFFF; border-collapse: collapse; border-spacing: 0px; border: 0px none; margin: 0px; padding: 0px" bgcolor="#FFFFFF">
<tbody>
<tr align="center" style="border-collapse: collapse; border-spacing: 0px; border: 0px none">
<td valign="top" align="center" style="border-collapse: collapse; border-spacing: 0px; border: 0px none">
<table width="100%" cellspacing="0" cellpadding="0" border="0" align="center" style="border-collapse: collapse; border-spacing: 0px; border: 0px none; margin: 0px; padding: 0px">
<tbody>
<tr align="left" style="border-collapse: collapse; border-spacing: 0px; border: 0px none">
<td width="100%">
<table width="100%" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0px; border: 0px none; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr align="left" style="border-collapse: collapse; border-spacing: 0px; border: 0px none">
<td width="100%">
<table width="100%" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0px; border: 0px none; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0px; border: 0; height: 50px">
<td width="100%" valign="top" height="50" align="left" style="background: #FFFFFF" bgcolor="#FFFFFF"><img width="1" height="50" style="border: 0; display: block; line-height: 1; opacity: 0; padding: 0px" src="http://mailrox-prod.s3.amazonaws.com/clear.gif" alt=""></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
<table align="center" cellpadding="0" cellspacing="0" width="100%" style="background: #FFFFFF; border-collapse: collapse; border-spacing: 0; border: 0; margin: 0px 0 0; padding: 0px 0 0" bgcolor="#FFFFFF">
<tr align="center" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td align="center" valign="top" style="border-collapse: collapse; border-spacing: 0; border: 0">
<div class="mi-all" style="display: block">
<table class="mi-all" width="566" align="center" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; display: block; margin: 0px 0 0; padding: 0px 0 0">
<tbody>
<tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="566">
<table width="566" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="566" height="117" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218755/490d09a47432a346ff8b0e78081c0893-original.jpg?1423832407" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="566">
<table width="566" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="62" height="208" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218759/19ddd566053aea03ffa236be1c3c7106-original.jpg?1423832410" style="border: 0; display: block; line-height: 0px">
</td>
<td width="437" align="left" valign="top">
<table width="437" align="center" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin: 0px 0 0; padding: 0px 0 0">
<tbody> <tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="437">
<table width="437" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="437" height="75" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218763/34af46b5e9b769c00b2ecdb0e18fb2f6-original.jpg?1423832414" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="437">
<table width="437" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="96" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218767/bd9eaee611c770ba4e1cf622dc3a8c2d-original.jpg?1423832418" style="border: 0; display: block; line-height: 0px">
</td>
<td width="52" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218769/45fec80922c3f48137c596c3ff749dfb-original.jpg?1423832419" style="border: 0; display: block; line-height: 0px">
</td>
<td width="83" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218771/b47339b9fc571427b652bddc8ff27308-original.jpg?1423832420" style="border: 0; display: block; line-height: 0px">
</td>
<td width="40" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218773/82abd90c62a69a367df080c998d95921-original.jpg?1423832422" style="border: 0; display: block; line-height: 0px">
</td>
<td width="42" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218775/bdc152f96b37a54241d4148d49370f3b-original.jpg?1423832423" style="border: 0; display: block; line-height: 0px">
</td>
<td width="41" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218777/6c5cecb72d86a5fd28304bc2d3c2251d-original.jpg?1423832425" style="border: 0; display: block; line-height: 0px">
</td>
<td width="83" height="49" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218778/1765f64e482ae6f647ac92dca014d991-original.jpg?1423832425" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="437">
<table width="437" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="437" height="84" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218766/674169b8b96dea256dd794836c855230-original.jpg?1423832416" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
<td width="67" height="208" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218762/425f7c48b0e4215a8f3109dc03927e76-original.jpg?1423832412" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr align="left" style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="566">
<table width="566" cellspacing="0" cellpadding="0" border="0" style="border-collapse: collapse; border-spacing: 0; border: 0; margin-top: 0px !important; padding-top: 0px !important">
<tbody>
<tr style="border-collapse: collapse; border-spacing: 0; border: 0">
<td width="566" height="185" align="left" valign="top" style="line-height: 0px; mso-line-height-rule: exactly">
<img src="http://mailrox2-dev.s3.amazonaws.com/crops/3218758/8eb37cb41486fd5f0528650bea1fe398-original.jpg?1423832409" style="border: 0; display: block; line-height: 0px">
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</table>
</body>
</html>
Again, this letter works great in everything except the Android Gmail application, I would like to know how to fix it.
Thank.