Eu criei um estilo para facilitar a formatação de snippets de código em e-mails. Quando eu aplico o estilo, aparece assim na nova janela de e-mail:
Noentanto,quandooemailérecebido,eleadicionaumespaçoembrancoestranhoentreabordaeosombreamento:
ExistealgumamaneiradecorrigirissonoOutlook?
Editar:AdicionandoocódigoHTMLdoemailconformesolicitadonoscomentários:
<htmlxmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
<meta name=Generator content="Microsoft Word 15 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
p.Code, li.Code, div.Code
{mso-style-name:Code;
mso-style-link:"Code Char";
margin-top:12.0pt;
margin-right:0in;
margin-bottom:12.0pt;
margin-left:.2in;
background:#EFF0F1;
border:none;
padding:0in;
font-size:10.0pt;
font-family:Consolas;
color:#242729;}
span.CodeChar
{mso-style-name:"Code Char";
mso-style-link:Code;
font-family:Consolas;
color:#242729;
background:#EFF0F1;}
span.EmailStyle20
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
-->
</style>
</head>
<body lang=EN-US link="#0563C1" vlink="#954F72">
<div class=WordSection1>
<p class=MsoNormal>Good morning,<o:p/>
</p>
<p class=MsoNormal>
<o:p> </o:p>
</p>
<p class=MsoNormal>Test text.<o:p/>
</p>
<div style='mso-element:para-border-div;border:solid #AEAAAA 1.0pt;padding:1.0pt 4.0pt 1.0pt 4.0pt;background:#EFF0F1;margin-left:.2in;margin-right:0in'>
<p class=Code style='margin-left:0in;background:#EFF0F1'>var test = new Test();<o:p/>
</p>
</div>
<p class=MsoNormal>More text.<o:p/>
</p>
</div>
</body>
</html>
Seu código abaixo usa "where it should use". O Outlook entende o 'mas não é compatível com html.
<div style='mso-element:para-border-div;border:solid #AEAAAA 1.0pt;padding:1.0pt 4.0pt 1.0pt 4.0pt;background:#EFF0F1;margin-left:.2in;margin-right:0in'>
<p class=Code style='margin-left:0in;background:#EFF0F1'>var test = new Test();<o:p/>
</p>
</div>
Alterar isso para <div style=" .... " e <p class=Code style=" ... " deve resolvê-lo.