We spend so much time carefully crafting our email marketing messages. From the concept to the design, the message and the perfect call-to-action – you take a look and know you’ve got a real winner for the inbox. But you’ve created your CTA button as an image and, in doing that; you’ve already set yourself for a less than successful campaign. In fact, almost half of the most popular email clients block images automatically by default. (Below is a list compiled by Campaign Monitor of email clients that block images by default.) So what’s the fix to keep your CTA front and center? Bulletproof buttons!