Try different email subject line styles to find what gets the most opens. [insert fun loading text here] Not just a pretty interface Don’t forget to add a fun, relevant call-to-action button to your email. A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. One Mississippi, two Mississippi… Test, test, and test again! Make sure your email looks good on all devices before you send it out. Let your imagination run wild.