Preview Disparity [RESOLVED]

I hope somebody might be able to point me in the right direction here. I have created a template drawing from the provided examples, but according to my client's design brief. It looks perfect in the preview in the Joomla back-end, but the output is always broken in the email as can be seen from the attachments.

Template here

The preview :

The actual mail as it appears in both thunderbird and apple mail:

As can be seen in the email example, the content block repeater appears to break after the title of the first article, the mailchimp branding follows, and then the remainder of the (unstructured) article content.

Please help.

joomlamailer version: 1.7.2
Joomla! version: 2.5.18
PHP version: 5.3.10
MySQL version: 5.5.35

It was eventually discovered that the content of this site contained illegal DOCTYPE, HTML and BODY tag declarations withint the content which were breaking the output in the mail clients. Might be worth filtering these tags out of the content in the same way as cache instructions are removed from the output.

RESOLVED.