Altered Process Email Template when sent

Hello,

We noticed that the process of email sending from Sugar is altering the html code of the email template.

We use Process Email Template to send some transactional emails to clients. These templates are designed in another tool and we get the html at the end of the design.

First problem is when you copy-paste the html in the process email template : the code is altered by TinyMCE. We overrode the html_tinymce field to allow style tags for example, so that the template still looks good after having saved the code.

But we still lose the head part of the html code. Unlike classic email templates, we can't manage the whole html but only the body part

Is there a way of defining the whole html in process email template ?    

Thank you,

Sylvain