Image in subject email voucher

On the subject email voucher does not appear the image of the selected theme, in the new version of OpenCart (1.5.1.3).

There is already a "cure" for this situation, already tested and is working well in Gmail with Internet Explorer.

Here's the link: http://www.opencart.com/index.php?route ... earch=html email&sort=e.date_modified&order=DESC

.... for anyone interested in resolving the situation.

Thanks,
az-vm