sbe emails: different layouts in differents mail clients

hi, we use sbe to deliver weekly summaries and shortly we added ultimate branding plugin on our website. We deleted header pic & footer content in sbe layout as these are generated by ultimate branding now. The emails now look different: The headline and content should start on same height right to the thumb.
Apples MacMail and Thunderbird show the mails wrong layouted, Gmail client does read it correct. see screenshots please.

I am happy anyone could help, its maybe only a small issue..
thx, Rob