What is the width of the Console email templates?

The width of all Console email templates is 600 pixels. So, if you are inserting in your emails elements with (fixed) width, such as images or tables, they should all be under 600 pixels in width (or rather 580 pixels to make sure). Otherwise, if wider than that, they will break the email "envelope" and insert blank spaces to its right margin, corresponding to the difference between the email template width and the wider element inserted in the email.