Hi there,

You can do some modification/replace uploaded file at this path ...\wJoomlaEB\components\com_easyblog\themes\wireframe\emails\html\post.new.php. Please give it a try and see how it goes . Also you can set the height of your email view at this line

<div style="padding: 50px; background: #fafafa;">

.
If the problems still persist, can you provide us with your backend and FTP access for further check on this issues?

Note: You have to backup for your file as this will be reset to default whenever you upgrade/update your Easyblog if you apply in the next upgrade/update.