Not everything is possible. Experienced email template designers will already understand the limitations of various email clients, and will adapt their designs to that.
But even from the most experienced designers we sometimes get designs where we run into a situation which technically cannot be realized.
Most of these issues arise when we get both a desktop design and a separate mobile design, where the mobile design is for explaining the needed responsive behavior of the desktop design.
When we run into this kind of issues, we will contact you for asking how to work around these situations.