Ecco qua un prova......
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Title</title>
</head>
<body style="margin:0; padding:0;">
<center>
<div style="margin:0 auto; width:990px;" />
<a href="http://www.miosito.it" target="_blank"><img src="http://www.miosito.it/images/email/header.png" border="0" /></a>
</div>
<div style="width:990px; height:398px; text-align:left; background-image:url(http://www.miosito.it/images/email/sfondo-1.jpg);">
<p style="font-family:Tahoma, Geneva, sans-serif; font-size:13px; line-height:20px; margin:0 10px 0 200px; width:780px; padding:80px 0 0 0;">
testo testo testo<br />
<a href="https://www.facebook.com" target="_blank"><img src="http://www.miosito.it/images/email/facebook.png" alt="Facebook" border="0" width="45" style="float:left; margin:15px 15px 15px 50px;" /></a>
</p>
</div>
<div style="width:990px; text-align:center; font-family:Tahoma, Geneva, sans-serif; font-size:12px; line-height:22px;">
<strong><span style="font-size:14px">
testo testo testo
</div>
</center>
</body>
</html>
l'immagine di facebook la vedo quella di sfondo ahimè no