I have already tried:
/inc/mail_templates/mail_template.php (changing the 150px to 300 or 600 or 900 and there is no effect)
$featured_image_style = 'max-width:150px;box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);float:left;background:#FFFFFF;border:1px solid #DEDEDE;padding:4px;margin:0 10px 10px 0;';
Is there a way, also, to just make the image fill the entire width and height of a email first up to a max setting and have the text and read more underneath the image actually?
Similar to the below sample link or better?
Lastly, I know changes similar to this may be overwritten on subsequent updates. I understand you are planning on introducing methods in a future releases, which will make it easier for users to customize different things like this without their changes being overwritten on updates. Does that plan include a way to do this on all your plugins or just the SBE only?