responsive-email

<table border="0" cellpadding="0" cellspacing="0" width="500" class="wrapper">
	<tr>
		<td>…Content…</td>
	</tr>
</table>

@media screen and (max-width:525px) {
	table[class=“wrapper”] {
		width:100% !important;
	}
}

@media screen and (max-width:525px) {
	body, table, td, a {
		font-size:16px !important;
	}	
	table[id=“responsive-table”] {
		width:100% !important;
	}
}

http://alistapart.com/article/can-email-be-responsive