Ourlook (Windows) does not support valign - This WORKAROUND will work:


...
<td colspan="3" valign="middle" width="300" height="2" style="width: 300px;font-size: 2px;line-height: 2px;"><hr color="888888" size="2" width="100%"></td>
...

 

Here's the result in Outlook 2016 for Windows: