"Our charity nursery has improved their event marketing thanks to PosterMyWall flyers!" - Paula Not just a pretty interface Don’t forget to add a fun, relevant call-to-action button to your email. Boost your email opens with a punchy subject line. Sit up straight. Is anyone even reading this? A mobile-responsive email can increase clicks by 15%. Always check mobile previews before sending out emails. Try different email subject line styles to find what gets the most opens.