The copy is very minimal but always clever. “Short and sweet” is their method.
The best part for me, the visually orientated designer, is that the email is really just a collection of images I can quickly look at. I generally don’t want to spend a lot of time reading through a long-winded email. iStock is effective in this way, directly providing for the needs of its busy clients.
The information conveyed is also useful, to see what other designers are using in their work. You can observe visual trends if you have the discipline to look at these images week by week.