I haven't purchased EW yet but you can do it with CSS It would look something like this
<table with="400" height="400" align="center" cellpadding="0" cellspacing="0">
<tr>
<td>
Here is some stuff<br/>
that will fill the cell now
</td>
<td style="border-left : 1px solid Black;">
Here is some stuff<br/>
that will fill the cell
</td>
</tr>
</table>
Just subsitute left for top, bottom or right if you want it on all sides just take out the "-(side)"
Hope that helps